when I did my car there were not as many parts available as today.
since I was not going original looks this is how my car was done to repair the rear panels. They were not too bad and could have been plastic welded and painted, but afraid the paint would scratch too eay so had the interior all custom done and this is how it turned out.
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made longer arm rest and removed the ash trays, covered the panels with the same material as the seats
IMO it was a good option over painting the panels that are under the soft material