Where do you find matching spray paint fir your truck

Unless the dealer has a bodyshop it wouldn't be practical to keep paint on the shelf.

 

Touch Up Spray Paint | AutomotiveTouchup

This is who we use recently. Just got some in a 1984 Lincoln Mark7 green last year. Base coat clear cote in rattle cans for under hood/firewall work.

We had a great professional supply place in San Antonio called Gladwin Paint Co. that could mix anything all the way back to the model T era and put it in rattle cans for you to use in tight detailed places like jambs and things.
Cali hipsters started moving in downtown and ruining it for the locals causing them to close up shop and leave the region after 50 something years in business.