When I saw that picture of the front spring mounts and those threaded rods going across I thought I was under our 70 again. We used rectangular tube, flat sheet and made what we needed as we went, was far easier than trying to make it exactly original. We tubbed it up to the frame rail and still got the back seat in. When I got to all that business across the back in front of the rear bumper, I cut it out and ran a piece of 1 1/2"x3" rectangular tube across, notched for gas fill and it worked great. Yours looks GREAT.