No one that I know of makes a dedicated touch up paint stick for wheels. A body shop or automotive paint store will have color charts that they use to mix paint with the formula. Most charts will have the formula for wheels and other non standard painted items. You could also look up wheel refinishers in your area. They could put you onto some paint for your wheels. Here at the dealership I work at, we have a guy that comes around to the used car lots and repairs wheels. He repairs road rash and scratches on most wheels. They charge about $50.00 per wheel. A small price to pay compared to a new wheel. A paint store will probably charge you $20.00 to make up a small bottle of paint, and you have to do it yourself. It will never look right brushed on. The whole wheel needs to be painted.