dont think they do them anymore at vw. i went in there the other day looking for centre caps for g60s n they said they stopped doing them. here is a person on ebay selling them
http://cgi.ebay.co.uk/Genuine-VW-Golf-Corrado-G60-15-inch-Steel-Wheels-NEW-/350390630603?pt=UK_CarParts_Acc_Wheels_tyres_Trims_Car_Rims_ET&hash=item5194e8b8cb
£160 plus £19 postage. brand new