Rear Armrest Bases on A-Body Convertibles?

This is stock (67dart)
Barracuda should be the same.

The metal is riveted to the plastic


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The pad has spring steel tabs that snap in.
( The ABC pads look nice but I have not had good luck snapping them in. The spring steel is too brittle)

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I recall someone saying that the aftermarket arm rests require screwing the pads on before installing the armrest plastic to the body.
Now I think I know what the interior shop is saying ... I ordered aftermarket interior side panels and I'm betting the metal plate underneath that is riveted-in is not there on it (ugh). I noted the metal tabs breaking in another posting you did. Well, just another problem to solve yet again.