I have 17x9 cobra r's currently. I have an 83GT which i put an 8.8 out of a thunder bird SC with Detroit locker and moser axles. Sn 95 spindles i will be installing when i get new wheels. Im looking to buy outlaw 15in rims and have no idea what back spacing or offset to get. i would like to use 7in wide in front and 8 or 9 in the rear. i bought 95 spec cobra r's and have minor rub issues in the rear by shock on inside and outside fender lip. Tire size is identical to when i had the 7.5 rear and 4 lug which i never rubbed once 275/40zr17. i drive my car about 3000miles a year if im lucky so i plan on running et streets for the rear wheels. Any help is greatly appreciated.