It turns out the M1009 had the latch for the 81-85 seats after all. I just needed to cut the hole in the floor mat and bolt everything down. So these seats will do for the time being until I can rebuild the originals.
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My guess is the army required both seats to fold to allow access to the rear so they used the S10 Blazer seats with new brackets to get them higher. The civilian seats for 1984 do not fold at all and access is only easy from the passenger side. It is better for my dogs to climb in though.Huh. My M1009 had that latch slot in the floor, but I didn't realize the whole seat pivoted up out of the way. Mine had 6 bolts to the floor, rather than four. Probably the same as what you pulled out. It seemed overbuilt. My Suburban's entire bench seat shared 4 bolts for 3 people!