Thanks! I'll try to find them. Just ordered a set of seat belts.The holes / threaded bosses are there, just look. Having said that if this was an original "export" car "maybe not"
Here's a couple pictures of the back seat area of a 69 barracuda vert. Should be close to what you have or at least show you where the holes go for the bolts. Note the beefy support plates at the back side of the middle two bolt holes.