Silly question, but many Formula's are Painted vs. Vinyl stripping....if yours is Vinyl I have no idea, unless you would find someone local to match the color. Assume it is an older boat, so doubt Formula has any stock. But if you can post, year and model and a few pics I am sure folks will chime in.
I think the also switched to Dupont Paint and Imron clear. Most of their Paint Colors are CUSTOM though, and they will gladly supply you with the Formula (no pun) of the Paint Codes on your Boat.