My car came with the radio with the equalizer (model UX1) but did not have the silver stripe. By reading what Dennis Kirban says in his book " KIRBAN'S GUIDE TO 1986 AND 1987 BUICK TURBO REGALS" at page 166, either one is correct.
I replaced it with a correect-looking DELCO cd player but still with the equalizer. It plugged right in without having any wires to cut, thanks to a GM sold adapter harness. The end result looks factory installed.
Thanks for the comment! As you can see in the last picture, the radio came with black knobs but I replaced them with correct '87-style knobs. I wanted a stock appearance and I think this is as close to factory looks as you can get!