Rear wheel trim, I assume you are referring to the wheel openings. I have a pair of stainless (base Regal and Limited trim) NOS original GM parts. $250 plus shipping...
i have a NOS GN or Regal antenna for $200.00 plus shipping and an used one for $100.00 plus shipping. I also have a NOS antenna bracket and used antenna bracket. I have the cable and the relay and the wiring available if needed...Dave