A-body armrest - stripped threads in door’s sheet metal
Rivnuts! So easy to use, you can use a tool like a rivet gun but even simpler is the one in the picture, just load the rivnut in the collet, hold with a wrench and tighten with a drill or impact gun or even just a wrench and allen key, SO simple I keep a kit with several sizes on hand you can get on Amazon or any faster store.