Factory wheels

My 68' Dart had a stock small bolt pattern 8.75 rear. I bought a 15x7 4.5" backspace steel wheel. It fit a 255/60 15 Mickey T Drag Radial. The section width of the Mickey T drag radials is not as wide a regular 255 tire. Just look at the spec on Summit website. I changed to a Dana 60 rear same width as my 8.75. I put stock 15x7 4.25 backspacing rear wheels with the Mickey T's. Fit perfect. No rubbing anywhere. Stock placement of springs.