Give Phil Schmidt a call at P.S. Engineering. He is building me a set of 17" Kidneys right now. I also would prefer 15' for the way they look but there are some really nice tires out there for 17's. Also, Phil should be able to build pin drive wheels for your SPF(Don't see any reason why he couldn't
). Might even be cheaper than you expect & he's real easy to work with.