I went with the Ford Racing 31 spline 5 lug axles ,with North Race Cars brackets that let you use Cobra rear disc with a stock Fox legth axle. I have 18 X 9 FR500 wheels with a 6.1?? back spacing with 275/35 BFG rubber. It has C springs and does not rub. I had to massage the inside front corners. The wheels actually measure 10" from the outside edges. It is stuffed but it fits.