Hi Paul:
You might try a search on "eight hole
wheels " - about 3 pages of threads return that way. The wheels are painted, sometimes clearcoated as well. Or sometimes they are polished and clearcoated. There are several past discussions on repainting kits, color codes for the wheels, body shop repainting vs. DIY. The most unusual 8 holes I saw had been repainted to the stock color, and the 'scallops' around the 8 holes had been polished, then the whole thing clearcoated.
Care and feeding of the wheels is like the paint on your car, except that the wheels get a lot hotter (part of the function of the aluminum wheels is to act as a heat sink for the brake hubs, according to an automotive engineering magazine I read at my Tech's shop). Since they get very hot, crud bakes on the surface - just like the car hood, but worse.
A good body shop should be able to re-spray them if you don't want to DIY (surface prep is key, and a PITA
.