Catalina, you list the correct code, 71643. That is Ditzler's code for:

1968 Pontiac "Solar Red"
1968 Chevrolet "Matador Red"
1968 Buick "Scarlett Red"
1968 Oldsmobile "Scarlet"

If they make DBC in code 71643, that would have to be correct. Did PPG issue a new recipe today in response to your inquiry?

Jim made an important comment about sealer color altering the final appearance. My spray out tests are over the original color. The paint would look different over yellow sealer than it would over black. I need to do another spray out over the actual sealer I plan to use.

I think doing a test spray-out is essential before buying $400 worth of paint and spraying the whole car with it.