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NOTES:

This article LIKELY HAS ERRORS IN IT.   It was not possible to physically look at every part listed here.   Parts numbers and descriptions were taken from a SnabbKatalog, and checked against a 1995 printed Parts List, and some were checked against my own stock of parts. A small amount of input was from others.

Be aware that BMW descriptions in its literature are occasionally wrong. Be also aware that in ILLUSTRATIONS, BMW may OFTEN show a piece of hardware...or other item, that is NOT the actual part. Examples of this abound. One might be that an actual Allen bolt is shown in the illustration as a screw or hex head.   BMW has sometimes kept a part number and then made changes to the part. In most instances this is of no major concern, and in many instances the updated part is better for some reason or other. Sometimes there are problems.   BMW has changed some of its nut wrench sizes, and maybe other such hardware parts changes that I do not know about. In one particular instance, which I believe is NOT HARDLY the only actual instance, the same part number was used for a nut that originally needed a 19 mm wrench, and the newer shipped parts are for 18 mm wrench, a size of wrench that is NOT a standard for BMW Airhead motorcycles. Thus, unless you want to carry the non-standard wrench in your bike's tool tray, you should be aware of this. In at least one instance, the dealer had BOTH sizes available in the same box.    I do NOT know the extent of this potential problem. I have seen it in 16 mm heads too.

In numerous instances, below, more than one number for a part may be shown. In SOME instances those are the same part, in other instances there are variations. In some instances those variations are noted. Keep in mind that the main purpose of THIS article is to enable you to go to a dealer and see various parts, and then decide what you want.

Bolt LENGTH measurements are from under the head to the end of the threads. BMW bolts for exterior use used to be, generally, cadmium plated to prevent rust. In some instances this plating provides a bit of anti-seize protection. BMW uses, generally, bolts rated at 8.8 strength, but at certain places will use stronger, and even 12.9. Strength rating is always marked on the bolt...and on some smaller screws too.
BMW has started to drop cadmium plating, due to environmental regulations. Many of its steel bolts and nuts may well now RUST!

NOTE: Some BMW bolts have a non-standard HEAD THICKNESS. An example of this will be seen at the left lower rear shock mount.

NOTE: the word 'screw' and the word 'bolt' are sometimes used interchangeably. Typically screw means smaller diameter, but there is no specification for just what constitutes smaller. Also, generally speaking, screw is used for such having Phillips heads or single slot heads.

PLEASE point out errors found, to the author
e-mail to: snowbum*jps.net; where the * is replaced by an @ sign

BL MU   sheet nut
BL SHR sheet metal screw (see ** note below)
DT RG   gasket ring
LIN BL SHR   fillister head self tapping screw (see ** note below)
LIN SHR fillister head screw (see note ** below)
LINSK BL SHR countersunk head fillister self tapping screw (see ** note below)
MU nut
SHR screw   (see ** note below)
SK BL SHR countersunk head screw (see ** note below)
SK SHR countersunk head screw    (see ** note below)
STI SHR studbolt
VSL SHR plug screw
ZYL SHR fillister head screw...per book, but is allen bolt??   (see ** note below)
SYL STI dowel pin
6KT BL SHR hex head (see ** note below)
6KT MU hex nut
6KT SHR hex screw (see ** note below)

** NOTE: BMW may use the word 'fillister' differently than in common American usage, at, say, a hardware or similar store. In America, a fillister head screw is NOT an allen head screw; but BMW's usage means allen head, that is, a recessed 6 point socket for use with an allen wrench.

Note also that -KT-SHR is really a hex head, although the SH might lead you to believe it is a allen type; and ZYL-SHR is a allen headed type. HB is supposedly a hex head bolt only.

BMW has sometimes substituted various types of heads, and you might order one type and get another type.

In general I have tried to separate out the confusion, in the parts listings below.

Hex nuts
07-11-9-922-053; -054 M-6 some books show this as a locking nut; other books show this number being replaced by 23-11-2-322-368.
07-11-9-922-081; -856; 07-11-9-921-076; -077; -074 M-8    some books have the 074 and -081 as locking types; the -081 is replaced now by 07-11-9-922-825, and THAT by -856
07-11-9-922-110; 11-11-0-001-104, replaced by 11-11-1-263-903 M-10 some books show -110 as locking,    the -110 is replaced by 07-11-9-915-558
07-11-9-922-122 M-10 x 1.0 mm
33-17-1-237-789 M-10, 12 point
07-11-9-922-148; -940 M-12 x 1.5    NOTE: may be 18 or 19 wrench size
07-11-9-921-631; -633; 07-11-9-901-309   M-14 x 1.5

Security nuts (similar to Nylocks; that is, they have plastic inserts)(BMW also has used other types of security nuts, some are here)
***Sometimes BMW will identify a nut as a security type, and it is NOT SO, so do NOT depend on the numbers here to be security nuts, without LOOKING at one.
07-12-9-922-404; -452   M-4
07-12-9-922-411; -410; 07-11-9-922-035; 12-31-2-322-422; 07-11-9-921-038 M-5
07-12-9-922-416; -417; -058; -800; -807 ; -704 M-6
07-11(and 12)-9-922-053 M-6    (some books show this as a locking nut; other books show this number being replaced by 23-11-2-322-368).
07-12-9-922-428; -427; -713; 07-12-9-964-675; -058; -716; -087; -096; 18-11-4-090-251   6KT MU M-8

07-12-9-922-435; -434 M-10 self locking
07-11-9-921-615; 07-11-9-900-079 M-10 x 1
07-11-9-922-148; -940; 07-11-9-921-627 M12 x 1.5
07-11-9-921-069; 07-11-9-901-307 M 16 x 1.5

Cap nuts (sometimes called closed dome nuts)
07-11-9-924-000 M-5
46-61-1-236-388; 07-11-9-924-403 M6
07-11-9-924-324 M-6
07-11-9-924-334 M-8
11-12-0-023-160; 11-12-1-744-330 for center of valve cover

Lock and wave (spring) washers (BMW has interchanged these at times per #, and I believe that sometimes BMW is not accurate on what type is which, as far as waverly, plain, locking.)
07-11-9-932-009   A-3
07-11-9-932-013   B 3
07-11-9-932-030; -033 B-4 waverly. 'dented' washer is 07-11-9-936-041; -042
07-11-9-936-041   J 4.3 STAR washer   (note conflict with above line!)
07-11-9-932-041; -043 A-5   -041 replaced by -098; -043 by -047
07-11-9-932-079;   07-11-9-933-095 A-8
07-11-9-932-046   B-5 lock (spring washer, 5 x 11)
07-11-9-932-062; -061; -070; -071; -072;    #6 or B-6
07-11-9-932-073   WAVERLY B6
07-11-9-933-082   M-6 lock may be error, may be flat washer
07-11-9-932-094;-093; -077   B-8 spring/waverly. Book is unclear. It appears that -094 is replaced by 07-11-9-932-079 which was replaced by 07-11-9-933-095, but -933-079. Suspect a digit error on the -933- term
07-11-9-933-095; -079   B-8 or M-8 lock (may be waverly)
07-11-9-932-112   B-10 spring; may be A; large O.D.; for medium diameter A-10 use -103 and -111; for large O.D. A10 use -122.   see also 07-11-1-242-296.
07-11-9-933-110   B-10 lock
07-11-9-936-042 J type 4.3 star washer
21-21-1-242-377 A 7.4 star washer (BMW calls it a fan washer); clutch washers
07-11-9-936-191 A 8.2 star washer
07-11-9-930-840 B8 SPLIT lockwasher. This is the washer that was used at the driveshaft U-joint before BMW wised up and eliminated it in favor of a slightly shorter bolt.
34-11-1-240-570 flat size 8 washer

Plain washers
07-11-9-931-029 black
07-11-9-936-405; 07-11-9-931-622; 07-11-9-931-015   3.2
07-11-9-931-033; -030; 07-11-9-936-415; -416   A 5.3
07-11-9-931-065; -660; 07-11-9-932-081; 07-11-9-936-432   A 8.4 or plain 8.4
07-11-9-931-826; -684 for M8 bolts ; 8.4
07-11-9-931-027   A4.3
07-11-9-931-043; -018; -650; -696; 34-21-4-044-133; 07-11-9-936-426; -408; -425   6.4 for M6 bolts
07-11-9-931-668; -664; -649; -077; -698; 36-31-1-451-479 10.5    A 10.5
36-31-3-004-378   Thick washer for rear axle of /5; also see 33-41-1-232-709 and 33-17-1-236-956 for some or all later models.
07-11-9-931-083 A-13, used on size 12 bolts

Plain (solid) sealing washers and crush washers (note that many early crush type washers are now being shipped as slightly different number and are solid type)
07-11-9-963-140; -130 DT RG C 12 x 15.5 crush, driveshaft drain and driveshaft fill.
07-11-9-963-999; -470; -047; -041;    DT RG C (or A)    8 x 11.5   Fork drain, late model rear drive oil level inspection hole.
07-11-9-963-213; -200 14 x 20 DT RG rear drive drain; transmission fill and drain.
07-11-9-963-259; -200   oversize 16 x 20 DT RG rear drive drain; transmission fill and drain. 07-11-9-963-252   DT RG A 16 x 20 as used at pulse air fitting at cylinder head and airbox.
07-11-9-963-073   10 x 13.5 x 1 solid washer for top of fork bolt
07-11-9-931-622; -015   3.2
07-11-9-936-413; -412; 07-11-9-931-637      A4 flat washer, 4.3
07-11-9-936-415; -416    5.3
07-11-9-963-010    DT RG A 5 x 7.5 small solid washer, fork drain
07-11-9-963-151   solid washer 12 x 17 fork bottom
07-11-9-963-034   solid washer, thermostat lower bolt 6.5 x 9.5
07-11-9-963-130   DT RG A   12 x 15.5   solid washer for oil cooler banjo bolt; also used at the neutral switch on early 5 speed transmissions. see also 61-21-1-355-262, and at fork lower, bottom, center bolt.
07-11-9-963-002   flat washer 3.5 x 6
07-11-9-963-310; -300 DT RG C 18 x 22   crush, engine oil pan drain. -300 is solid.
07-11-9-963-420    DT RG 26 x 31 used at dipsticks until 1980. Part is obsolete, but UNconfirmed information was that POSSIBLY #11-43-1-337-308 will work.

M-5 hex head bolts 6KT SHR
07-11-9-913-212   5 x 8
07-11-9-913-218   5 x 10
07-11-9-919-613   5 x 12
07-11-9-919-903; 07-11-9-913-252   5 x 20

M-6 hex head bolts 6KT SHR
07-11-9-913-426; -432; 07-11-9-914-148    6 x 10
07-11-9-913-441; -014    6 x 12
07-11-9-913-451   M 6 x 14
07-11-9-913-465; -015; -464; -466; 07-11-9-911-218   M6 x 16
07-11-9-913-470; -019    6 x 18
07-11-9-913-476; -016; 07-11-9-915-030; 07-11-9-913-114 M6 x 20
07-11-9-913-567    6 x 22
07-11-9-913-480; -018    6 x 25
31-42-1-240-053    6 x 28
07-11-9-913-499    6 x 28, could be 30 mm
31-42-1-237-529; 32-71-1-240-053; 07-11-9-913-590; 31-42-1-240-053; 07-11-9-913-573    6 x 30
07-11-9-912-303; 07-11-9-901-189    M6 x 35
07-11-9-912-312; -323    6 x 40
07-11-9-912-326; -324    6 x 45
07-11-9-912-335; -337    6 x 50
07-11-9-912-360    6 x 65

M-8 hex head bolts 6KT SHR
07-11-9-911-605; 07-11-9-910-342    8 x 12      thread pitch 1.0
07-11-9-913-618; -624; 07-11-9-901-191; 07-11-9-919-939    8 x 16
07-11-9-913-640; 07-11-9-901-120   8 x 20
07-11-9-913-652   8 x 22
07-11-9-913-656; 07-11-9-901-125   M8 x 25
63-12-1-356-921   8 x 25   as used on side of /5 headlight shell
07-11-9-913-662   8 x 30
07-11-9-913-111; -674; 07-11-9-912-477; 33-41-1-232-701   M8 x 35
07-11-9-912-507   8 x 45
07-11-9-918-655   8 x 50
07-11-9-912-556   8 x 80

M-10 hex head bolts
07-11-9-911-631   10 x 1 x 20 as used with /5/6 oil filter inner cap
46-52-1-235-511   10 x 20 special shoulder bolt used at center stand
07-11-9-913-807   10 x 12
07-11-9-913-831; 07-11-9-913-834   10 x 25
07-11-9-913-839; 07-11-9-901-166   10 x 30
07-11-9-913-837; -844; 46-71-232-703    10 x 35   -837 may be 10 x 30
07-11-9-913-855; -853; -868; 07-11-9-901-169; 33-53-1-232-702   10 x 45
07-11-9-913-859   10 x 50
07-11-9-912-453; 07-11-9-919-756; 07-11-9-901-107   10 x 60

4 mm Allen bolts ZYL SHR
07-11-9-919-381    4 x 12

5 mm Allen bolts ZYL SHR
07-11-9-919-611; 12-13-2-322-416    5 x 8
07-11-9-919-614; 07-11-9-900-311    M5 x 16
07-11-9-919-617; -903; 12-31-2-322-418    5 x 20
07-11-9-919-619    5 x 30
07-11-9-919-908; 12-31-2-322-417    5 x 45

6 mm Allen bolts ZYL SHR
07-11-9-919-910   6 x 10
07-11-9-919-792   M6 x 10, with captive waverly
07-11-9-919-912   6 x 12
07-11-9-919-621; -965; -913; -912   6 x 16
07-11-9-919-918; 46-54-2-322-498   M6 x 18
07-11-9-919-716; -920; 23-11-2-322-407    6 x 20   The -407 usually has a deep head which is
    particularly nice for use at the oil filter outer cover/housing.
07-11-9-919-921; 46-71-2-322-405; 07-11-9-919-625   M6 x 25
07-11-9-919-927; 31-42-2-311-105   6 x 30
07-11-9-919-931; -932   M6 x 35
07-11-9-919-937; 46-61-2-322-494 6 x 40
07-11-9-919-630   6 x 50
07-11-9-919-956; 61-12-2-322-496   6 x 60

8 mm Allen bolts ZYL SHR
07-11-9-919-637   8 x 12
07-11-9-919-640; 07-11-9-901-023   8 x 16 some books say 8 x 15 for -640
07-11-9-919-974; -969; 07-11-9-920-151   8 x 20      -974 may be 22 mm
07-11-9-919-646; 07-11-9-901-024   8 x 25
07-11-9-919-647; 07-11-9-901-025   8 x 30
07-11-9-919-984; 07-11-9-901-027 8 x 35
07-11-9-919-648; 07-11-9-901-029   8 x 40
07-11-9-919-638; 07-11-9-901-033   8 x 45
07-11-9-919-649; -796; -803; 07-11-9-901-034   8 x 50     -034 may be 8 x 45
07-11-9-919-651   8 x 55
07-11-9-919-656; 07-11-9-901-036   8 x 80

10 mm Allen bolts
07-11-9-919-662   M10 x 12
07-11-9-919-787; 07-11-9-901-039   10 x 20
07-11-9-919-769; 07-11-9-901-049   10 x 30
07-11-9-919-740; -771; 07-11-9-901-064   10 x 35
07-11-9-919-756; 07-11-9-901-107   10 x 40   may be error, -107 may be 60 mm long
07-11-9-919-672; 33-17-1-454-309; 07-11-9-901-088   10 x 45
07-11-9-919-739   10 x 50

Threaded lengths; studs
07-11-9-908-255   STI SHR   6 x 25
07-11-9-908-104   STI SHR   6 x 40
11-11-1-252-310   STI SHR
07-11-9-903-306   STI SHR   8 x 18
07-12-9-903-326   STI SHR   8 x 25
07-11-9-903-349; 07-12-9-908-130   STI SHR   M8 x 35
07-12-9-908-141   STI SHR   8 x 45
07-12-9-908-135   STI SHR   M8 x 50???
07-12-9-908-137   STI SHR   8 x 55
07-12-9-908-145   STI SHR   8 x 65 original valve cover center stud. LONGER:   07-12-9-908-142, 70 mm
07-11-9-908-385; 07-11-9-903-436   STI SHR M 10 x 35 SN 4
07-11-9-908-391   10 x 55. Appears to be obsolete; probably replaced by 07-12-9-908-177...???
11-11-1-257-397   275 mm cylinder stud, 10 x 1.5 mm
11-11-1-265-195   297 mm cylinder stud; used at right side, rear, both, 10 x 1.5 mm
46-71-1-230-475; -762 long threaded at both ends studs used at footrest   M12 x 1.5 thrds
46-71-1-230-762, engine mount stud, 306 mm long
46-71-2-311-725, engine mount stud, 315 mm long
46-71-1-230-475, engine mount stud, 327 mm long

Common?? screws, can be slotted or phillips, EVEN IF codes say other type
07-11-9-907-701   special screw used at fairing vents, really a size 3, but book says B2.9 x 6.5
07-11-9-928-432; -130; -103   M4 x 16   SK SHR, screw used at fairing vents
07-11-9-907-603   3 x 10 LIN SHR see next line
07-11-9-907-602   LIN SHR AM 3 x 8 screw used at one style of crankcase oil breather;
   NOTE: book shows -602 to be used for -603
07-11-9-907-604   LIN SHR AM 3 x 10
07-11-9-907-616   LIN SHR AM 4 x 10
07-11-9-906-435   LIN SHR 4 X 12
07-11-9-913-373   4 x 10 ZYL SHR AM
07-11-9-919-381   4 x 12 ZYL SHR AM
07-11-9-901-703   4 x 12 LIN SK SHR
07-11-9-901-720; 07-11-9-928-439   SHR AM 4 x 20 phillips
07-11-9-907-639   LIN SHR 5 x 10 used at seat side rail
07-11-9-907-627   LIN SHR AM 5 x 12
07-11-9-901-771   5 x 15 LIN SK SHR AM
07-11-9-906-415   SHR AM 5 x 16
07-11-9-928-485; -487; -488   5 x 15 LIN SK SHR M    replacements are 5 x 20
07-11-9-901-771   LIN SK SHR 5 x 15 used at the seat strap
07-11-9-907-631; -633   5 x 20 LIN SHR AM
07-11-9-900-810   SK SHR M 6 X 10   counter sunk allen head used at seat hinge
46-63-1-236-414   SHR M6 x 30

Miscl. hardware:

51-14-4-034-136: This is the frame ID metal plate, come flat, you must curve it, it fits the steering head area, is designed to be riveted in place. These are unobtainable from BMW, AFAIK. Bob's BMW has them, you have to stamp in your model, serial, etc.

61-12-2-302-574   solid, better construction, flip-cap cover for the electrical accessory socket. This is a K bike part that fits.
46-31-1-244-384   UNconfirmed number for a blank plug to fill the RT/RS large round dash holes when no voltmeter or
                                  clock.
11-11-1-744-327   black rubber timing hole plug
46-51-1-234-785   black plastic cover for hex head of M8 bolts
52-53-1-230-313   black rubber bumper used over the seat locking rod, that fits into the seat lock
52-53-1-232-904   round bumper with attaching tit, used at the seats
61-31-8-050-134; 63-12-1-244-378   Chrome washer, side of /5 headlight shell
61-31-8-050-136   rubber washer used with above Chrome washer
61-13-8-050-138   rubber sleeve used with above two items
07-12-9-934-318   special type of C clip used to hold seat to right frame rail pegs
46-63-1-235-759   closed end tube-grommet/rubber/plastic?...to cover fairing screw sharp tips
46-63-1-235-760   B 4.2-4BL MU   BMW's version of Tinnerman nut for fairings

07-11-9-902-513   BL SHR BZ 4.2 x 19   the screw used with those Tinnerman's, above....there is a short version 4.2 x 16 #07-11-9-902-514 which is replaced by -497

07-11-9-907-944; -946   LIN BL SHR BZ 4.2 x 13 another of the screws used with the Tinnerman's
07-11-9-902-467; -468 black phillips head sheet metal screw
07-11-9-902-441   silver colored phillips head sheet metal screw 3.5 x 16
07-11-9-902-429   phillips screw 3.5 x 16 used at fairing rubber tunnel; replaced by -441
21-21-1-231-463   ZYL SHR special bolt for clutch. Note that except for the R46 and R65 which use a smaller bolt, that BMW changed from an early slot screw to Allen style. #'s for these bolts have been that -463, and 21-21-1-242-371 and 21-21-338-680

26-11-1-230-414   special 12 point bolt, M8 x 14.5 for U-joint, original early type that used actual split style lockwasher B-8 07-11-9-930-840.   This combination is to ALWAYS be replaced by a shorter bolt withOUT that washer, 26-11-1-242-297 13 mm length.

33-53-3-054-174   27 mm thin nut used at the swing arm
13-11-1-259-869   screw for Bing vacuum takeoff tube; -870 is the washer
13-11-1-336-900   METAL fuel T fitting
11-12-1-337-818   rubber pads used for quieting the cylinder head fins.
46-63-1-235-510   cup washer for fairing taper head sheet metal screws.

71-60-9-024-186   U shaped bolt used at cylinder crash bars, size 8 threads.
46-71-1-230-794; 46-71-1-237-759   U shaped flat clamp with one threaded end, used at cylinder crash bars, size 8 threads. The ABOVE THREE bolt/clamp units are used on the large SINGLE crash bar that covers both sides on the early airheads.   There is a single type, one for left, one for right, and the clamp is 46-71-1-235-772 in chrome (now 46-71-1-230-794) and 46-71-1-237-759 in dull black

11-13-0-007-163; 11-13-1-744-329   magnetic drain plug used at transmission
11-13-0-007-162   oversize magnetic drain plug used at transmission
11-41-2-343-498   magnetic drain plug....not airhead
23-11-1-230-599   hollow breather bolt used at transmission speedometer cable and battery -
07-11-9-905-660   special set screw, MAY have slot M4 x 6 x 3    neutral switch on /5
07-11-9-941-332   3 x 18 roll pin
07-11-9-944-651   4 x 10 roll pin
07-11-9-941-471   5 x 50 roll pin
07-11-9-941-475; 07-11-9-941-470   5 x 60 roll pin
07-11-9-941-485   6 x 16 roll pin
11-42-1-335-394   special 23 mm bolt for draining thermostat/cooler. ****Do NOT use if longer than 23 mm!!!
16-11-1-232-237   plastic washer that fits 4 mm screws
16-12-1-240-513   16 x 2 rubber O-ring

07-11-9-987-611   lock bow. clip. This bit of shaped round steel WIRE is used to lock the balls at the shift linkage and the hydraulic damper balls.

32-72-1-230-874   knurled knob-screw, with nylon insert and captive spring, used as throttle lock on models drilled and threaded for same.

07-12-9-948-739   3.2 rivet
07-11-9-947-201   6 x 25 rivet
46-63-1-233-909   expandable rivet used at windshield
07-11-9-949-633   A 6 x 0.4 x 10 tubular rivet used at top of fairing area

61-13-8-080-160   Rubber boot for the speedometer cable where said cable fits the right side rear of the
                                 transmission

TOP HAT SPACERS:
BMW uses various spacers that I CALL top hat spacers, and BMW may call Thrust Sleeves..   These are spacers with a flange on one end, hole in the middle.    In airheads prior to 1985, on twin shock models, at the rear wheel, these are used to space the axle (this is NOT the many sizes available preload spacer that does NOT have a TOPHAT). It is common to see the stock one be replaced by the 10.7 mm wider one that BMW supplies to move the rear end over slightly (especially pre-1982), to allow a wider rear tire.
Rear wheel spacer, 10.7 mm width (height): 36-31-2-301-737.
36-31-4-038-142, This spacer, noted above, is the stock one, it is typically 0.359" wide (height, usually ..with slight variances seen)...in fact have seen them from 9.0 to 9.2 mm.
36-31-230-322. This top hat spacer was made in two styles with the SAME part number!   BOTH have a width (height) of 12.9 to 13 mm. An early version was extra wide on the top hat portion...a diameter of 31.95 mm nominally. The "seal' surface of this spacer measures an O.D. of 21.95 mm.

There are other top hat spacers used on the bikes. Some models of airheads have top hat spacers at the rear swing arm adjustor area, inside, between frame and swing arm. They are VERY similar in size to the wheel spacer, and can, really, be interchanged.
Information on using some for wheel movement is found in articles on the wheels on this site. Sometimes one must add flat spacers or move rear disc brake arm slightly, etc., when dealing with certain types of tires.

23-13-1-241-484 special clutch arm (arm at rear of transmission) pin, that has a flange, and won't fly out. This is used with a clip that is part 51-23-1-864-963. These two parts replace the earlier pin that uses a C clip, that sometimes came apart due to being improperly assembled, and then a transmission ear got broken off.

Initial upload: 02/25/2003
01/22/2007: All prior revisions incorporated, and some omissions on the Roundels straightened out ABP
02/01/2007: top hat spacer information expanded
02/13/2007: greatly increase Roundel information, edit other areas for such as the frame ID plate.
04/02/2007: add -475 stud; edit roundels area, strictly for clarity
04/26/2007: Correct error on -082 Roundel, and add more Roundels, and improve description on some
07/03/2007: Add information on sizes and lengths of cylinder studs.
10/24/2007: Roundel information moved to its own article, 68B, where it will be greatly expanded