Just get some 1 1/4" wheel spacers, you can go more but you have to start worrying about bending the axle tubes if you are hard on it, I have friends that run 2" spacers and love them but they are easy on there stuff. Ebay for spacers. I run a 15x10 aluminum wheel and like tham alot has the 3 3/4" or just a tad more back spacing but never rub the springs because I don't turn that sharp with stock axles, that how you break the birf's.