70-72 Rear body panel trim

[novab]

I'm looking for the length of an original taillight trim panel. I have an aftermarket (Goodmark) tail/body panel and with the taillight installed my trim panel will not fit between them. The taillights are outward as far as possible in the opening. My guess is the light openings are off. The panel I have measures 36 1/4" on the finished side, end to end, right in the middle. Can anyone give me a measurement on a factory original trim panel. Mine is a die cast one I bought through Trim Parts. Any help would be helpful.