Bucket seat ID help needed

Going thru a few things in my attic and I need some help finding out what these seats are out of. Thanks for any help IDing them.

Bottoms

I'm guessing a GM product with the release button behind the headrest.

That entered my mind too but I've had some of this stuff for 40 years and it gets kinda foggy. I rounded up 5 GM and mopar radiators too but thank God Mopar stamped numbers on them. Thanks for the help.

That's an AMC seat.

Ohhhh boy. That's gonna be a "hard sell" LOL. I might up having them forever.