A cheap set of 16" with 205/60r16. If your willing to put up with something a bit scratched & battered you'll find them for $100-$200.

If want it to look factory fresh then you'll get mint ones for $400. In particular, look for the 16x7.5 Audi alloys with 225/55r16. Would be perfect on a Scout.

15" should fit as well.

All my relatives in Austria & Germany run winter wheels & tyres