‘64 Dart Three Point Seatbelt Help

I added 3 point belts to a 64 Belvedere wagon I used to own. The B pillars had trim on the inside of them in that car, so that made it easier to hide my installation. I mocked mine up and decided where I wanted the seat belt bolt to go into the B pillar, and drilled a hole big enough for the seat belt bolt to go thru. Then I made a plate that was 6" long, and what I thought was barely wide enough. I didn't have to mess with the headliner area, but the headliner was out. On that car, the B pillar was tapered to narrow towards the top, so I made the plate to match. I welded the nut on it, and drilled a small hole towards the top of the plate. I ran a piece of welding wire down thru the B pillar to an access hole near the bottom of the B pillar, and ran the welding wire thru the hole I drilled near the top of my plate. Then I pulled it up into place and tried to put the seat belt bolt in to hold it. I had to let it in and out seemed like 20 times to get the edges ground down to where it would snugly slip into place. I marked the B pillar edges where the plate was, and drilled holes along both edges at my marks, to spot weld thru to the plate behind the B pillar. I actually impressed myself when I had enough sense to replace the welding wire with mason string to pull it up for the last time to weld. If I had left the wire and cut it off like I did the string, and let it fall into the B pillar...it would have made a little rattle that would have driven me nuts! :BangHead: I drilled a hole for the seat belt bolt in the trim piece, and it looked like it was factory. I am confident that it would have held, but thankfully never pressure tested it! I hope your installation works like you want it to. :)