If they are the same as the 14" versions then the centre caps are the same as those found on BBS RM's i believe, in other words expensive! I don't know what a refurb costs in Spain, but if it is anything like over here then i'm sure it will be a hell of a lot cheaper than buying new. It would cost around £170 to get all 4 refurbished over here, and that would be diamond cutting the spokes and rim, and painting inbetween the spokes so i'd imagine just a straight refurb would be a little cheaper.