The tutorial that I read also said to use the silver paint that is stock for all german cars, which is WURTH. They have a website plus some auto body parts stores near you may carry it. It is standard on BMW, Porsche, Benz, VW. It will match perfectly if you aren't doing all wheels and need it to match. If you don't, then I guess another quality brand wheel paint will do. They also carry the clear cote.
