Black on black unit from a 70 Cyclone GT 351-4V auto A/C car, located above glove box, which would be D0AZ-9E718-C according to the MPC. The cover does not have the suffix, only the "D0AF-9E718- " text string.
I've included Mercury and Ford MPC info as well.
Mercury used D0AZ-9E718-A, B, C, G, H and D1AZ-9E718-A on their car lines
Ford used D0AZ-9E718-A, B, C, G, H, and J.
Total number of variations = 7
Perhaps body and cap color combination was used to identify the application?