Swinging for Divorce…

DentalDart said

I was thinking when the book mentions the bracket being welded on to the car it was literally this bracket. And with this bracket the stud goes through the hole

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That sounds like a better thought process than I was thinking.

Is there any signs of spot welds on the backing plate?

The photo I posted was from a video from AMD replacing a rusted 69 quarter. It's not super clear but I did not see a backing plate. But who knows.

The 2 tabs dont seem substantial to retain the reflector cup all by themselves.

I just saw 3 references for the markets and it says A & B body front and rear except Dart.

The cup is like what you have and the backer is like you have too.

So odd