Gordon Nichols posted:My car is all covered up and sleeping out in the garage, but IIRC when I slide the seats all the way back, the outside edge of the seatback has a lot of side room to the body. There is maybe 1/2" between seat backs as they hang over the tunnel. I had lots more trouble getting the seat bottoms to fit between the central tunnel and sills. Took quite a bit of seat bottom frame mods to get everything in there. I'll post my seat photos below - they came from a '92 Chrysler LeBaron GTS Turbo.
On the seat belts, I have lap/shoulder belts from a Chrysler. I kept the inertial winders and mounted them behind the seats. The loop for the shoulder belt is bolted to the roll bar. The other two anchors are about where they would be on a modern car.
Yes, stainless doesn't have a lot of shear strength so they tend to snap when torque is applied (but you know that, now.) I can't help with where to use it, other than where-ever you don't want the fastener to rust and look, well, rusty. I also use stainless in places where I might want to remove the fastener some time in the future without messing with rust. But it seems that might not be the best choice, given your update.
Thanks, Gordon. Love those seats!