I fitted some Audi 18 inch wheels that have a cap bore of 57.1mm for caps. They came with the single cap & nut covers but with a removable Audi logo.
I took off the Audi logos and bought these SEAT caps which I prised the badges off and stuck them off the Audi caps. These badges are about 57mm diameter, so matched better than using the typical 54mm versions.
https://www.ebay.co.uk/itm/4x-Seat-...Silver-60mm-/173749416118?hash=item287445b0b6
The wheels now look like this: