Yes, I know; there were no yellow Camaros in 1991, because of retooling for the 4th gen. Mine was painted yellow as a project at my high school's shop class long ago, and I was told it was painted the same color as a '91 'Vette, and now I could use a little paint for touch up. Question: is the "Performance Yellow" on the '91 'Vette (Competition Yellow -53 WA9804) the same as the yellow on pre-91 Camaros (35 WA 8769)? Sure, they have different numbers, but they look alike in the Sherwin-Williams auto paint book.

 

go to your local paint supply store and have them take a camera reading. There are 1.1 million alternates out there so no off the shelf color will match perfect. If they take a camera reading and mix you a few ounces that will be your best bet to get something in the ball park.