1965 Dart Chrome Bumper Surround Trim

I think I found an internet article about the very same car's rear end that is shown in your pics. Looks like they turned it into "wall art" as the original vehicle was not in good enough shape to bring back.....

1965 Dodge Dart - $4,900 - Cleveland Power & Performance

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When you check out the rest of the pics, you can see '68 style sidemarker lights were added, so I surmise the trim you're asking about was added "after the fact" as I have never seen this trim on a factory original car....