i fit a 315/60-15 drag radial in a stock wheelwell but its VERY tight. i made all my own offset hangers to bolt in the factory locations (stock suspension BS) wheels are 15x10 with 4 inch backspace with a 5/16 spacer. could probably use a 3.5 but may be a little close to the inner. housing is 57 1/8 axle flange to axle flange