Some 17,s will fit.
I have 17,s on my Leon which has s3 brakes (same spec as
Cupra brakes).
17" Audi a3 sport alloys fit straight over the brakes.
17" Leon sport alloys fit with small spacers when pads and discs are new. Now that the pads have worn down I have been able to remove the spacers.
Hope this helps.