I have a 79 f250 with a 4 " suspension lift I just ordered 36x13.5x15" superswamper iroks. The problem is on my truck now i have 16.5 inch rims and the brakes are very close to the inner lip of the rim. They sell american racing rims in 15" 8 lug. Does any one know if they come with enough back space or not so the brakes can fit or do the make some kind of spacer.