I'm looking at the diagram for the rear seat belts in a 76 Ford truck/Bronco manual and it
shows the bracket as being a component part of the seat belt i.e. sewn into the belt.
Is this not the same for a 66?

 

you are correct, but i have all the other pieces so what i lack are the angle anchor brackets. if i can get entire seatbelts, so much the better, but i can make do without entire seatbelts for the time being, and it might be more expensive than just the angle anchor brackets alone... i am literally crawling my way to the finish line here (smile)... making the anchor brackets from scratch is possible but would probably be much more expensive than finding a used set from someone who does not need them and would (hopefully) be willing to part with them inexpensively for a worthy cause...