Trunk hinge supports welded in today. Removed the temp support rods, and she stayed at 17". So I removed the dutchman after making some measurements. Low and behold 48" is exact between the seams from the quarters to the dutchman. Puts 24" being dead center of the car.
It fit pretty good for an aftermarket part, but required a little bit of work to get it to fit in the rear corners. It stuck up too high even with everything clamped tight. I ended up making cuts on both sides and working the metal down so it sits level with the edge of the quarter. I will weld it up and grind it down in those spots.
I still have to remove the remnants of the C channel that attaches the dutchman to the package tray. That is rotted through in spots and will need to be replaced. The green colored one out of the parts car will need to be sandblasted and primered, along with the quarter skin tops I intend to use.
I will be repairing the corners of the rear window opening that the dutchman doesnt cover as well. I will have to drill the dutchman to temporarily pin it in place for now with cleco pins, since I also have to carefully cut and graft in the quarter panel tops shown in the previous pix.