| OEM | OEM | Description | Used on |
| 660-37C | 25586-37 | Cam gear cover bushing | 1937 to 1950 |
| 660-37D | 25591-37 | Cam gear cover bushing | 1937 to 1948--74" & 80" side valves |
| 660-37E | 25593-37 | Cam cover gear shaft bushing | 1937 to 1950 |
| 66002-49 | | Battery 45 AMP | 1948 to 1954--OHV--Two way radio |
| 66002-49AD | | 45 ampere battery, dry charged | 1949 to 1957--Models equipped with two way radios only |
| 66004-26 | | LM5 Battery, wet, with terminal fittings | 1926 to 1936-74" side valve |
| 66006-29 | | Battery dry, 22 amp/hr 6V | Servi-car, DL, RL, WL, WLA, WLC 1929-1964. UL, Knucklehead, Panhead 1937-1964. |
| 66006-29D | | HM5 battery, dry charged | 1937 to 1957--all models |
| 66006-65A | | BATTERY, 32 amp. - 12 V. | 65 to * -- FL, FLH |
| 66010-29 | | Rubber jar only | 1937 to 1954--all models |
| 66010-49 | | Battery rubber jar | 1949 to 1954—Models equipped with two way radios only |
| 66012-29 | | Wood separator | 1937 to 1954--all models |
| 66014-29 | | Rubber separator | 1937 to 1954--all models |
| 66015-49 | | Battery filler plug (3) | 1949 to 1953--models equipped with two way radios only |
| 66016-65 | | FILLER PLUG (6) | 65 to 72 -- FL, FLH |
| 66018-29 | | Filler plug | 1930 to 1957--all models |
| 66021-28 | | Filler plug washer | 1929 to 1957--all models |
| 66022-49 | | Battery filler plug washer | 1949 to 1957--models equipped with two way radios |
| 6603 | 6016-36A | 1/2"x 1 3/4" x 1/8" Plain steel washer | |
| 6605 | 6245-30 | 1/2" x 13/4" x 3/16" Plain steel washer | |
| 6609-36 | 88860-36 | Window with frame | 36 to 57-61",74"& 80" twins, sidecars |
| 661-31 | 271 | Cover bushing pin | 1937 to 1950 |
| 661-36 | 25581-36 | Crankcase cover gear bushing | 1936 to 1954--OHV, 1932 to 1957--all W & G models, 37 to 48-74" & 80" sidevalves |
| 661-36A | 25582-36 | Crankcase cover pinion gear bushing | 36 to 53-0HV |
| 661-37 | 25599-37 | Crankcase cam gear bushing | 1937 to 1948--74" & 80" side valves |
| 661-37A | 25601-37 | Crankcase cam gear bushing | 1937 to 1950 |
| 66100-15 | | Battery mat (2) | 1937 to 1957--all models |
| 66110-23 | | Set of battery terminal screws & fittings | 1923 to 1957--all models |
| | | Part 66110-23 (Set of battery terminal screws & fittings) consists of: | |
| | | 66112-23: Terminal screw | |
| | | 66115-23: Battery terminal felt | |
| | | 7628: 10-24 N.C. x 3/8" x 1/4" hexagon nut | |
| 66112-23 | | Terminal screw | 1923 to 1957--all models |
| 66115-23 | | Battery terminal felt | All models 1923-1964. Servi-car, JD, VL, DL, RL, WL, WLA, WLC, UL, Knucklehead, Panhead. |
| 6613-36 | 88862-36 | Window only | 36 to 57-61",74"& 80" twins, sidecars |
| 66200-48 | | Battery carrier for box | 48 to 57--G models--two way radio |
| 66202-29 | | Battery box, with cover & nuts | DL, RL, WL, WLA, WLC 1929-1952. |
| 66203-40 | | Battery box, with cover & nuts | Servi-car 1940- 1963. |
| 66203-40A | | Battery case only (black) | 1940 to 1957 -- Servi-cars |
| 66204-65 | | Battery carrier | 1965 to 1969 -- FL, FLH |
| 66204-70 | | BATTERY CARRIER | 70 to 73 -- FL, FLH |
| 66204-74 | | BATTERY CARRIER | 74 to * -- FL, FLH |
| 66212-65 | | SUPPORT BRACKET | 65 to * -- FL, FLH |
| 6624-36 | 88892-36 | Side member, right side | 36 to 57-61",74"& 80" twins, sidecars |
| 6624-36A | 88896-36 | Side member, left side | 36 to 57-61",74"& 80" twins, sidecars |
| 66288-24 | | Clamp bolt pin | DL, RL, WL, WLA, WLC, Servi-car 1929- 1963. Singles 1929-1934. |
| 6630-30 | 88938-30 | Side member stud nut (2) | 36 to 57-61",74"& 80" twins, sidecars |
| 66302-29 | | Fender studs screw plate | DL, RL, WL, WLA, WLC 1929-1952. |
| 6631-30 | 88941-30 | Frame end-L. H. | 30 to 57-61",74"& 80" twins, sidecars |
| 6631-30A | 88945-30 | Frame end piece-R. H. | 30 to 57-61",74" di 80" twins, sidecars |
| 66350-42 | | Battery lower cushion | 48 to 57--OHV, two way radio |
| 66351-42 | | Battery upper cushion | 48 to 57--OHV, two way radio |
| 66352-65 | | CUSHION, battery cover (2) | 49 to * -- FL, FLH |