I know this subject has been beaten to death, but if I put 15x8" Torq-Thrust II's on the rear with 255/60's, what wheel size would I use on the front for a 225/60 tire? 15x7"? 15x6"? Has anyone had rubbing problems on the rear with an 8 inch wheel and 255/60's? Stock rear--71 Comet GT. Thanks...