Those are pretty simple. The lower seat back will have small slits or holes punched in there. You just probe in the hole, or you can cut the material if it is in disrepair, and there shouldnbe screws just drilled into the side panel behind the seat. The screw heads should be accessible under the vinyl and foam. Usually there are two back and one side on each back and two on the center. All other fasteners you can see with the brackets.