Seat back drops down on the tabs at the top of the panel. You have to push in on the to engage them. I think it is has 2 loops coming down off the spring metal frame at the bottom that are bolted to the back panel. Mine never had those bolts installed at the bottom, but I think that's the setup. The seat bottom is pushed in under the seat back. Has loops coming down that hook on the pieces welded to the floor pan. It's a tight fit, really have to force the seat bottom and the loops to the back to engage them in the hooks on the floor. That will lock it all together. The metal filler panels on the sides of seat back are screwed to the side, not the seat. The plastic side panels have the armrest and ash tray molded in, they fill the gap between the side metal that holds the window mechanism and the seat bottom.
All of the above applies to a 70 but I believe at least the seats mount the same on the earlier version Chevelles, pre-68.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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