73-76 Dart Sport rear metal trim question

That's a,74 up thing.
Tail lamp bezel and center section
They were when new pot metal chrome plated and then the recessed parts were painted silver.
Best to go d a better used ones.
As the post metal is full of holes now on yours
To replace any post metal or paint is work.
Plating requires full strip and filling holes with layers if copper and sanding. One layer at time
Painting requires the same strip, fill with high build primer sand in steps.
You could shoot it after with a highest silver as you can get.
Then tape it up and shoot the recessed parts a darker silver.
That would be best option.