Here is another picture with the seat removed from the truck and opened up like a book. Again, the black metal is the seat back bracket and the bare metal is the slot attached to the seat base frame. Unfortunately, I cannot show you more without removing the upholstery.
Kent
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rsz_20221010_121630.jpg (40.94 KB, 76 downloads)

Last edited by Lightholder's Dad; 10/11/2022 7:25 PM.
1937 Chevy 1/2 ton
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1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix