The BBS rims are definitely chrome. The only known chrome ones on a Contour and only the 3rd set of BBS RX I've seen on a Contour. So I'd say pretty rare.
With as many people on here with the RS5's, I seem to be one of the only guys with the optional lug nut covers. Looks better if you ask me. I'm looking to get rid of the BBS rims as a package or just rims to save on shipping. Email me if you're interested.