Paint code Question

[16927]

On my 81C10 the glove box sticker tells you what the options and paint code is mine is 43p emerald green no idea what the P stands for anyone know?

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[75gmck25]

For my ‘75 GMC the paint RPO code is 62L, and then the next column breaks it out into “62 buckskin 12 frost white”.
I also have RPO ZY4, “deluxe two-tone paint”.