1972 Duster Org. paint Resto detail

Pinch weld on my 73 Duster, Original paint , F8 green not painted. It does have the radiator support blacked out.
Twenty years ago I saw a factory memo, although I don't think it was a TSB, that talked about what colors received the black mask behind the grille. I think their was a color or two more but i remember two of the colors on the list that didn't receive the "mask' was Black and dark blue. This detail on the fender we have at least two known tb3 car that have it and the one white or sand beige car in the salvage yard shot. You would think Yellow would have been on the "paint' list also. Will have to PM member in California with Survivor Duster and ask him to photo his fender attachment point and see if his is painted. His car was light blue.