That car pictured above is a GTX, see the hood scoops, fender emblems, and headrest bucket seats in white? RO cars had black bench interiors. Interesting that the gtx
Wheel well and rocker trim is gone and has add the Belvedere II body trim.

See this picture for a better shot of the white interior GTX car. Door panels, 13" square front arm rests, rear seat drop down in center.