I bought my car used and it has BBS wheels but the center cap is missing on one of the wheels. I can't seem to find a replacement because the center cap has the Porsche shield and not the BBS logo. Perhaps this was something the previous owner did custom? The person I bought it from was a second owner and could not answer the question either.

 

Here you go mate:
http://www.pelicanparts.com/catalog/...g13.htm#item61