Steve just a thought but I would just buy the silver ones and sell the red ones? I have seen to many that guys try to paint and it does not last. And what it will cost to take them apart and have them powered coated you can buy the silver ones and be less money if you lost a few bucks on the red ones.
Here's a pair on flebay.
http://www.ebay.com/itm/05-12-C6-Gra...e4b57f&vxp=mtr