I can't reach my lower seat rear bolts with the folding back installed without a lot of contortion a wrench and cussing. I installed the lower seat then the folding back fully assembled. 4 bolts hold the back through the hinges. My car had two shim packs that go between seat back hinge and the body for alignment as well. The shims were originally taped to the body mount and I did it the same way after restoration and re-assembly. Covers on the hinges were installed lastly.
You can see the shims here.
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