Mark,
A suggestion that I can not take credit for, take one of the cars to Home Depot and have them match the paint. I have a pair of SD-60s that had been badly abused, I went to get matching paint at my LHS but a couple of tries failed. Ed Goldin suggested the Depot for the paint, nearly perfect color match in satin finish, and about $3.00 for a trial jar will do all your cars and enough left for the rest of your local club.
Ray