17x8 front and 17x9.5 rear. They fit without spacers on an M Coupe or Roadster. I ran 235/40-17 and 255/40-17 track tires, which fit perfectly. Cheap spare wheel if you run this setup.

SSR Comp 17x9.5 ET 15 BMW fitment (Z3 M Roadster/Coupe). $75

SSR Comp 17x8 ET 40 BMW fitment. $75