I bought a second hand 18" wheel from SGT with the chrome rim and allow centre for an S3 Aero. It was described as in excellent condition but when I went to get it I found this was rather an optimistic view and it was pretty heavily curbed all the way round.

I didn't think it could be refurb'ed but Brands Hatch Morgan found someone who did a fantastic job and the wheel looks new again. No idea who but someone at BHM will know. It was quite a lot to refurb - I think just under £100 but the wheel is as good as new again and was very poor before!