Great earlier posts and tech info, but I do have one question about the full 280 SL caps. There are apparently stainless steel and chrome. The instructions for polishing the hub caps with Mothers Mag Polish I assume is only for the stainless steel hub caps. I believe mine are chrome, and one is duller than the rest. I would love to liven it up, but do not want to do more harm than good. I am afraid that an agressive polishing job will scratch what chrome I have left. Any advice? I have tried chrome polish, with little positive results. New hub caps would be vbery expensive, and if I send one for crroming, obviously all need to go, so I will probably limp by with one dull hub cap.