I am not sure exactly what you are needing. Unless you are talking about the trim that screws to the top of the back seat (I don't think you are) the trim will be Barracuda or Dart specific and year specific also.
The parts hold the top of the plastic side panels on each side of rear seat. The panels cover the metal inner body structure and parts are attached to that body metal. Rear quarter window handles go through the panels. Hard for me to describe the parts and I've never really seen them, but they secure the top of the panel and fuzzies.
