The two frame seat mounts closest to the driver's side door are rusted out. The rest of the frame is nearly rust free so I believe a repair is worth the effort. Any suggestions on repairing? I'm thinking pop rivets since I do not weld.

If you are talking of where the seat mounts actually bolt to the floorpan, I would use rivets only to be able to mount the seat in long enough to get it to someone that can weld the repair in.

 

You want that area as strong as it was from the factory.