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Mine has 3/8" socket with a logo on the bolt head a capital letter M with a Letter T running up the center leg of the M,and by the way,the holes in the actual armrests,where the bolts go,are kinda ragged,like they have been removed or replaced several times....in the larger sizes,a lot of hardware stores probably have a better selection of hex head bolts than phillips head.....so is it likely that in the 36 plus years that these trucks have been around,its quite likely that most of them have had these bolts/screws replaced with whatever was at hand,and if the correct Ford part was discontinued,it shouldnt be a shock that few are still original
I would think that, given the era of these trucks, that if the screws had been replaced with hardware store stock, you would see quite a few that had flathead screws rather than phillips or hex head. Also, I would think you would find a mix in any given truck, rather than all hex head, or all phillips. If something was a replacement, why would they replace six bolts to make up for loosing one? I only know of a few people that **** to go through that much trouble. I don't think the four trucks I have worked on have had owners like that, especially the ones that didn't show any sign of ever having been opened up.