Sorry for not replying sooner but I've been sick.
Sherwin Williams Automotive paint.
Look locally for Automotive paint suppliers, most used to provide this service back in the day.
Problem is the EPA, a lot of larger paint shops do their paint matching/mixing in house.
Most paints now a days are all water based.
As I recall I had to order CARC online from a third party who had a CAGE code, but my memory might not be 100% ‘‘twas a long time ago.