Give me a bit to dig around I'm not up on the OEM part numbers , pretty sure yours has been swapped out before , happens . The 1/4-20 size uses the prestolite US made starter , came mostly on the FLH and 80 and up rubber mounted bikes but in 79 harley tossed everything at everything . I'll send the info when I can , Good luck or there's sharp people in here who may know ?