[bouncytruck]

I would run a roll bar no matter what you do with the seat belts. These rigs are top heavy and the fiberglass top, if you have it on at the time, isn't going to provide too much protection in the event of a roll over. You may even consider a cage that covers the back seat so the little ones are safe too. There is a guy on CK5.com that made some nice brackets to attach 3pt seat belts to his roll bar. It looked sharp, sturdy and functional. If I run across the photo again, I'll send it to you.

You can buy new truck belts. Until you posted the link to the belts for sale on e-bay, I thought they were the same as the front Blazer belts. I think the only difference is the passenger side retracter. Someone correct me if I'm wrong.