Center caps advise! Pirelli p slots

Getting my p slots diamond cut with black inners, I want to fit small black centre caps, as the centre bore is 57.1 will other mk1 centre caps fit? Like the small vw logo ones on snowflakes or steels, thanks 

buy some metal caps?

What kind?

pirelli metal ones but there rather expensive

jellybelly said

pirelli metal ones but there rather expensive

Even harder to find than the wheels lol, I just want some small caps to slot into the centrebore