Hi everyone,
Just wanted to update this thread.
I was able to get to the nuts by removing a thin metal plate that was bolted to the bottom of the cab. I can't remember the size of the nuts that held the plate in but they were really small.
Anyway, once I had access, I used from pliers on the main nuts and then used a socket on the bolt in the cabin.
Interestingly, only the front two mounting points had the nut, the rear mounts did not - and on my supercab, the rear seats didn't either - they were all bolted through threads in the cabin floor.
Before I re-install it all, I'll try to take some pics and post them here.
Thanks for the input!
1985 Ford F150, 2WD.
351 H.O Windsor, aluminum heads
Cam: Lift = .496''/.520'' Duration @ .050: 224°/234°
C6 Transmission
6" Rough Country Lift
33x12.5x15 BF Goodrich All-Terrains
15x10" Pro Comp Rims