Just a heads up on my experience with removing the rear folding seat from a '67 Fastback. I followed all of the steps above and removed a ton of the rear interior trim before I realized that if all I wanted was the rear seat out, it was as simple as removing two accessible screws holding down the metal hinge cover and then removing two bolts holding the seat hinge to the body (both sides of course). Removing all of the interior trim was not necessary. Not sure if '67 and '68 are different, but it seems they are the same based on all the detailed trim removal steps cited above. No worries in my case because I'm stripping the entire interior out of this donor car anyway, but yeah, heads up before you begin.
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