1969 dodge dart rear rim size

I had a set of 15x7.5 Centerline Convo-Pros that had a 5" back spacing that center perfectly in the rear and rubbed the front upper A arm with 225/60/15's. 5/16 spacer in the front got them to clear but the outside of the tire with flush with the outside of the fender. For reference I think factory 15x7 wheels (i.e. cop wheels) had an approx. positive offset of 6mm for the 73-newer disc brakes as they widen the front track.

Bottom line I gave up on off the shelf wheels fitting. This is with 73-newer fronts discs and 11x2 rear drums with a BBP conversion on a factory A-Body 8-3/4 housing. I'm now Dr Diff 13" front and 11.6" rear.