The black is supposed to be there on the 71/72 but the reproductions come not painted. See below for item descrition from OMS
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Item #D1ZZ-13450
71-73 TAIL LIGHT LENS AND TRIM - Tail lamp lens and bezel assembly with Ford oval, in lens. Bezel is anodized aluminum and heat welded to the lens just like the originals. Correct for 73, but to be correct for 71-72, you must mask and paint black the inner edge of bezel. Reproduction.
*Ford oval and numbers SAE-TSIAR-71MG in lens.
Price: $89.95
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A little more history of the changes for 73
1973 would mark the end of the first generation of the ponycar. The Mustang had gained 575 pounds and was over a foot longer. Mustang was destined to undergo an extensive change in design for the 1974 model year.
The 1973s were unchanged from their 1972 counterparts, but there were some differences to distinguish them. The front grille size and shape remained the same but the plastic egg-crate mesh was larger and mounted further forward. The pony and corral lost the horizontal bars but the shorter vertical ones returned. A new vertical parking/turn signal lights were mounted at each end of the grille and the entire area was surrounded by bright trim. Headlights fit into fender extensions and were housed within a chrome, rectangular bezel. The taillight bezels were bright metal. To meet government five-mph impact standards, the front bumper was fitted with a color-keyed, urethane impact-absorbing system and the rear bumper was mounted further away to comply with impact regulations.
The Mach 1 received a new bodyside tape treatment and a three-quarter vinyl roof was optional on the Mach 1 and other SportsRoof models.
Engine availability was unchanged from '72. The Hurst shifter with four-speed transmissions used a round knob rather than Hurst's T-handle.
Total production : 134, 867 units. In all, a total of 10,820 SportsRoofs; 11,853 convertibles; 25,274 Grandes, 51,480 hardtops; and 35,440 Mach 1s.