Put the passenger side seat belt in then realized The driver side was broken and partly gone.
Guess I'll be starting a parts needed thread for a black 74 seat belt.
you should un twist the belt on the top. Take the bottom retractor off and turn one time counter clockwise
And also I had the same problem with the retractors in the seat belts and switched to 1973 style ones with the clips that hold the top half of the belt to the headliner