On mine I took the water heater door which was damaged and they scanned it and mixed a spray bomb up for me. This was at an auto parts store that sells automotive paint as well as every thing else
It was pricey at $35. but it matched perfectly.
Dennis & Marcie & Hook The Jack Russell, 2001 HR Imperial 38wds 350 Cummins, 07 Chevy Trailblazer/Blue Ox/Ready Brake, 04 Dodge 3500 Cummins,