Just bought a set of race star 15x10 and 15x3.75 wheels with 325/50/15 rears and 23/5/15 tires for my 04 cobra IRS!!! I realise i will have to do some grinding but not sure exactly how much? Or if a massive tire like that will even fit in the wheel well? Bought em off america muscle back spacing is somewhere around 6.5.