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I suspect these are frame structures for the door pockets, the part that has the door pull.
That;s the only place I've seen those mushroom studs that go into key-holes in the inner door frames.
(';')
I just looked at mine, all the pocket structures with these studs are curved, and the straight parts are way too short..
I don't remember any of these mushroom thingies on the door card either, but it's been a couple years since I had one of them off.
(';')