At a local DIY store they had a large Testers Paint display, every conceivable color in tiny "hobby bottles". I found a near perfect match to my Evo Grey powder coat, the paint even has tiny metallic flecks like the PC. Take a look at Testors.
That's a great point Jeff. Thank you. I will look into Testors and let everyone know what I find (as I'm sure others might want to be privy to what matches). In the meantime, I picked up some Sally Hansen nail polish. They had one that was a dark gray metallic color. By adding some black to it, I was able to match the shade of the wheels almost exactly.