[Dan in Pasadena]

Biglass,
Thanks so much for the photo. I stuck my hand up the pillar as far as i could and it seemed very tight. 3/16 flat bar MIGHT fit in the space; i was thinking more like 1/8" max, but definitely not with a nut of any kind welded on it. At least not on my cab. I only felt the driver's side but I assume both sides are the same.

This is why i told Mike to cut into the pillar to expose the inner layers of sheet metal and to fab a 1/2 tube or bar with nut and weld it to all possible sheet metal layers. It definitely won't be as strong as a modern car and if a hard hit will deform the pillar, but if it keeps my face from meeting the steering wheel, I'll be satisfied.

Anyone know the dimension from floor to shoulder belt bolt for 5'-10" person using the factory bench seat?