I found the Petty Blue paint!
Petty himself said-
"we had a couple cans of blue but not enough, and we had a can of white..."
The key to Chrysler codes and changes is the first character-
That's why "B5" is not enough info.
EB5, GB5, and KB5 are all different.
1969 formula, 1971 formula and 1974 formula.
"T" B3 is what year formula?