I have installed 05 GTO seats into my 65 2dr wagon. They have the buckle attached to the inner seat.
What do I use to complete the selt belt? This was a "race car" and the original belts are long gone and my other cars are not in this garage so i'm not sure if the oem belt will just click into this.

Easiest option would be bolting a stock retractable seatbelt to the outside floor and be done.
I could find a car and cut/remove the B-pillar seat belt and adjuster. Then modify it to my B-pillar. Then I will have 3 point belts.

Anyone have an opinion or ideas? Thanks

Tagging along. I am heading down the same road.

This is a bit off topic from your question, but can you post some pics of the seats in your car? I was thinking about picking up a set of these seats and decided to go with Scat Procars instead.

The Procars seem too tall for my 72. They fit, they are just really close to the ceiling.....I may change over to the GTO seats yet!

Check out MorrisClassics for seat belts. I got some for my 70 ElCamino when it had a bench seat - it was nice to have 3 point set belts.
I installed some GTO seats in the car and they won't work because the seats are located much further back. Called Morris and I think they can make a set that will use the GTO attachment at the seat. Give them a try, they were really nice to work with.

Matt