Hi Guys,
A 5 inch backspace is fine with fiberglass fenders. Without them, you will be rubbing on the fender with a 35 inch tire. Stock backspace is 6. 125" on the cast wheels and a little more on the steel. We have a Centerline wheel with the 6 inch backspace available. It is on special in the website. The wheel size is 17x8. 5 with 6 inches back.
Thanks,
Greg DRC