The charcoal upper door color and sail panels would be the same as the 5X8 on V24 Duster cars. So they would be the "low gloss" black color. The J54 code is for the "sport hood" which I am not sure but believe that is the black painted inserts with the dual hood scoops. The J81 wing for 1971 was the gull style. There were exceptions as some of the earliest cars seemed to have received the go wing (Mustang) style wing.
