I see SummitRacing has Wheel Vintiques 15" X 6" with 3 3/4" back space (which is nearly identical to the 14" X 5 1/2" with 3 3/4" back space factory Rallyes). They also have 15" X 7" with 4 1/4" back space (rear). I think the 15" X 7"s will work out back, but I need to do more measurements after our road trip to St Ignace this weekend.