My 1941 Ford COE P322
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What you see here are the means by which the Bed Supports are fastened to the Bed,
Inside that Square Tube are two Threaded Rod Couplers , the Short black Button Head Bolt
is screwed into the Coupler and the Button Head will be welded to the Square Tube.
Ignore the other SHCS, it was the only other bolt I had at the time

So once the Button Head is welded and gound smooth, the SHCS will be fastened from underneath to the Bed Support
And hold it all in place.