Here is an interesting turn of events. I cut pie shaped reliefs, and bent the wheel well support plates in half 90° so the rear seat back would clear and I could fasten it vertically. The wheel well sheet metal is so thin it just tore apart from the bolting-in procedure. I cannot believe this thing was expected to survive a crash just bolted to the floor and wheel well. Now I am going to cut and weld in some 1/8" steel support plates inside and outside the wheel well. I can also make some plates for under the rear seat floor. That way the factory sheet metal gets sandwiched in between real metal. My buddy has an iron works shop and he gifted me a 60" x 16", 1/8" thick steel sheet. Now that the blast furnace summer is almost over I can do some cutting and welding without getting heat stroke.