We use Dupont paint and the computer that mixes up the paint, matches about 75% of the time, there are just alot of alternates for foreign cars if anyone reading this has a gold car, i feel for the painter.
Anyways, we get the paint though a company called Finishmaster, they supply us with alot of 3M and Dupont materials needed for the shop. We use Keystone primarily for what i was discussing eariler with the bumpers and repaired rims. If youve dealt with them before then even better, they might have you take in the rim or they'll pick it up to see what your rim looks like, to see if its even repairable.
Ok let me know what happens with your rim, let me know if you go though those guys or not and let me know how it turns out. Knock on wood but Ive never seen anything that was unacceptable come back to the shop from them. Good luck