I have a local auto paint supplier that I use for that regularly. I have to take him the PMS color chip and he scans it with the handheld scanner they use to take color readings off of cars. He mixes it in the U-Tech base coat/clear coat material. For electric signs, channel letters, cut-out letters, etc. I also get the Azko flattening paste which turns the high gloss clear coat into more of a satin finish, but just as durable. Anyway, it's a perfect color match evertime.
U-tech is made by Azko-Nobel and his scanner also says Azko-Nobel on it, so maybe it's their system that gets me so close. The manufacturers number is 800-618-1010, maybe they can tell you the name of your local supplier.
Best of luck.