Just to add a bit more, the truck I looked at had the bolt through the fore/aft floor z-shaped section as you can see in pic 3.
The other pics are of the front mounting nuts from under the truck. Pic 1 is of the inner front drivers side. Pic 2 is of the inner front passenger side. If you don't have the formed z-section reinforcement that runs from side to side (which only comes installed on factory bucket trucks and Blazers), you'll need to fab something up like mcbassin did in his install.
The last pic is of the original mounting bolts and a vintage koozie that was under the seat.
I hope this helps everyone out and the major parts of this thread would be great to put in the FAQ section. Thanks to mcbassin for starting it and everyone who contributed!
