Reproduction CEV tail light mounting bracket as used on 850T, 850T3, V7 Sport, 750S. The V7 Sport parts book suggests this item could have part number 14474900. These brackets are thinner than the originals, they have no stamped lettering, and the chrome is no longer actually chrome, but rather a metallic paint. Once mounted up they look pretty good regardless.
For a black version of this bracket, as would be used on 1969-1971 V7 Special, Ambassador, 850GT or Eldorado, see part number 080174110