Not really sure if you want to change seats, but I have a 63 1/2 ton and i installed bucket seats from a 2003 Chevy truck. The seats have the retractable shoulder strap and the female end built into the seat. The seats I found were in excellent condition. The seller wanted 300 but I talked him down to 200. The seats fit really good but I had to make a bracket for the center portion of the seat because the hump is different. The center portion also has seat belts. I think the bench style seats in newer trucks are the same way.