1970 bench should have two buckle ends on the seat for shoulder belt and lap belt for driver and passenger. Also a belt for a middle passenger. The shoulder belts on the headliner have female ends. 3 belts held down with each bolt on the tunnel. It is a big stack of seat belts on the seat.

The clips to hold the belts at the base of the seat were not available in 1970, but they would tidy up the front seat for sure.