Thanks for the info. Pictures of what I have are attached. Both the parts car and the restoration had the longer bolt on the tunnel. The parts car, with standard belts, had the shorter bolt at the door openings. The restoration, with Deluxe belts, had the straight gold cad bolts holding the retractors at the doors. I guess I'll purchase the short shoulder bolts and a pair of the straight bolts as well. Interesting that AMK offers GM seat belt shoulder bolts in both lengths, but the thread size is 1/2", not 7/16" as all of these are. I wonder if that's a typo.....
What about anchors for the rear seat belts? My restoration came with them, but the ends of the belts were simply bolted together and through the floor under the back seat. Is this right? I doubt it......
Chuck