As Lee has kindly pointed out, just because they are 15" rims, doesn't mean they are going to fit . Each wheel has different rim widths and / or offsets, as well as different clearances inside the wheel, so just because it is a 15" wheel, doesn't mean squat .

If it was MY S1, I would want to keep the original wheels, so my advice would be to do what Blakeya did - just use 4x4 discs....