Need to know what size slick I can get under my car? I currently have a 275x60x15 drag radial with an 8" wheel under it. Dont remember the back space but fits well and looks good. I need to know what size slick would be equivilant to this? I know its 28" tall and roughly 11.5 wide. I would like to run a 10" rim maybe down the road and need to know the backspacing too...Thanks. My car has no quad shocks.