ok so heres the lowdown. had to find out myself. 56 caps are cheap and plentifull and just as custom as a 57, i happen to like them just as well, gotta go deep. you can get them cheap and are always easy to find if some *** cobs em. 57 caps are out fricken priced and not very plentifull. i went to summit racing today and about pissed them off pulling rims out and checking fitment of the 56 cap. heres the deal, Aero racing wheels for roundy round cars, 15 x 7 with 3.50" backspacing and at 44.95 a copy. part # AEO-50-174535. they come in about any bolt pattern and are rated higher than oem rims. hope this helps, sure helped me????????????? like a sore peter,you just cant beat it!!!!!!!!!!!!
that's rad. Thanks for doing the leg work on that. When I was doing the research for myself a few months back I came across some things as well. I hear they fit early 60's caddy and GM wheels but I'm yet to fit them myself. Hopefully I'll be able to hit a tin yard early in the year. I'll dig this post back up and add to it.
ya that would be good but as for me im putting them on a 51 merc and using ford 5 on 4.5 bolt pattern. gm and caddy wont do so all ford and dodge can use these rims as well as gm. they have all common bolt patters