Yes, I understand what you need. As far as I know, the 73 Camaro had those metal pieces under the door panel fabric, and didn't have separate trim. I have a 75 Camaro Rally Sport, and that's how it is also. I'm saying find some door panels from a 73 to 81 Camaro or Firebird and salvage the metal pieces from the door panels
No one lives forever, the trick is creating something that will.