68 GT convertible project

This is kind of backwards but I'm taking the seats to the upholstery shop tomorrow. The seats are taking up space in the garage and I don't want those nasty things in my house. I removed the seat tracks tonight. They look pretty rough. A long soak in a rust remover should clean them up. I'm missing the pieces under the seats that connect the track reliece levers. Was there just a wire connecting them or was it a spring of some kind?

The springs in the seat backs are very rusty. Hopefully they will be usable. Once the frames are stripped, I'll take them in to be blasted and powder coated. Then they will go back to the upholstery shop.

The front seats still have the chrome inserts in the seat backs. There isn't one on the rear seat...should there be?