thanksSlider said:I copies these part number from another thread:
~55mm OE VW center cap part number: 6N0 601 171/BXF
~62mm OE VW center cap part number: 7D0 601 165
AFAIK these are the only two sizes avaiable. You can buy them from a dealer or any of the myriad OE part retailers mentioned on this site. I purchased some for my BBSs 10 months ago. I don't remember the price.