The Stovebolt Site Forums The Shop Area General Truck Talk 1956 rear wraparound glass and 3-point harness mount

I installed 3 point belts from Seat Belts Plus in a ‘52 5 window and installed a plate that they sell that goes in behind the pillar. I modified mine by grinding off one corner and bent another to fit the contour. I drilled the bolt hole then lowered the plate from above. You could try lowering it on a string from above. (make a big loop so you can cut it from above to remove it). Once I threaded the bolt and tightened the plate the the pillar, I pop riveted it in place so the belt could be removed in the future. The same process should work for yours.