I bought a set of 28-10.5-15 et drag slicks from a guy. He ran them on his 80 regal drag car. Ill be running them on my 87 regal. He didn't know what size rim or back spacing to run. Any body got a clue? I need to order some rims soon. 9 0r 10 inch wheel width? and backspacing? Hope somebody can help me out. Thanks