I have a 9566AA COPO that has - B for the paint code. When I bought it in 1984 it was Daytona Yellow and still is. On the build sheet it has ZP3 SPEC PAINT and 1001HA. In the 44 color box, it is hand written a - B. I have never really looked for any marking on the firewall . I took the gas tank out and it has yellow overspray on the bottom side of the truck pan.
Gregg
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