1971 Challenger rear seat back lower mounting hardware

[KillerBee]

1971 Challenger.

What type of screw or attaching hardware is used for the wire loop at the bottom of the rear seat back to connect it to the floor.

I have my rear seat back just sitting there and it tends to slide up.

I know there are brackets on the floor pan for the loop to connect to, but what hardware is used there?

Thanks.

[Bullitt-]

Rear seat back..Course thread bolts, one each side

[KillerBee]

If I remember right the hole on the bracket where the wire loop lined up to was much bigger and maybe even square shaped?

I'm gonna have to pull the rear seats again to check.

Thanks

[Bullitt-]

no other hardware that i can find, apparently screws into the metal