67-9 cuda door repair questions

If what you refer to as "arm burner" trim the is belt molding... Any convertible has a similar molding around the top well. If your vert didn't have complete belt molding that well trim has a final/end piece. Those with belt molding had a different transition piece that connected the top well molding to the belt molding at the quarter window. Belt moldings from below a fast back quarter window wont work on a vert but those moldings from a notch back can be cut to fit to the vert transition piece.