Where about in CA are you?
Costa Mesa
Where about in CA are you?




Not sure when they changed over to 3 point rear belts, might be 90-91 only. I know my 87 has rear lap belts ONLY. Sounds like someone swapped in an earlier rear seat, for whatever reason, which would have the female retractable ends in it that would click into male ends bolted to the floor.
If you are fine with lap belts only, find a set of male ends from an earlier K5. Top can be removed and you still have (lap only) belts.
If you want the 3 point set up you may need to find a rear seat and belts from a later truck with the 3 point system. Problem is, the rear belts become useless when you remove the top.
Super slick solution, adapt a 3rd row seat from a newer Suburban to your K5. These seats have a 3 point system integral to the seat, which means you can remove the top AND have a good, modern 3 point seat belt system in the rear. BUT, you need to be sure about your fab skills to mount that seat properly so that it (and it's passengers) don't go flying out of the truck in the event of an accident.
Once you up yourself to membership status, there is a thread in the tech articles section all about new seats in old trucks. But you need to be a member to access that section as well as see the pics.
I used 02 Silverado seats in the front of mine, heven't done a rear yet. The rear you want to look for is from the similar era Burbs/Yukons 3rd row.

That'll do, but they want too much. Early 00's models work too. Keep an eye on C-list, you'de be surprised how many people trade those trucks in and then realize they have the seats sitting in their garage/basement. You can often pick them up for around $100 or less.
