Visited the truck today in the shop and visually confirmed ( as Brian mentioned above) that the tub reinforcement brackets have welded nuts on all mounting points.
Also, thanks for the complements. I did end up powder coating the bar and it's components.
Here is a pic of the top side of my 74 in progress.
it's currently at the shop so I can't view the bottom but I recall some if not more holes requiring nut and washers on the bottom side.
I believe some model roll-bars had welded bolts at the base plate that extended through the body that were...