2 rear seat belts buckles and 1 front seat belt buckle (they can be used either in the front or back, for example for Corvettes just the front). 1 rear seat belt.  See pictures for details and to see it fits your car.  These seat belts were pretty much used in 60s and 70s Corvettes, Pontiac LeMans GTO Tempest, Oldsmobile 442 Cutlass, Chevy Chevelle, El Camino, Buick Skykark.  A-Body GM cars.  Great price for these old original parts.