I am not sure what brand of powder they used, but if you tell your shop "silver vein" they should have some idea. If not call 509-542-9431. Ask for John, tell him you saw the wheels on Trevor's camaro and wondered what brand of powder it was. If you don't have a local shop, ship to him and he'll do em.
On a side note for some of you..... please don't insult me by making pathetic low-ball offers on here. I know you are looking for a deal, but I assure you I am not going to give away the tires/wheels. Go price out some new ones, then ask yourself if you want to pay over $1500 just for the stupid tires for this car. If you are serious, and have an offer that is close I'll consider it.