Looking at a '72 build sheet, box 67 for Seat Belts says; S- BLK. Does the "S" stand for standard? I have a couple different sets of '72 seat belts I could put in the car. The black webbing/black buckle, or the black webbing/brushed stainless buckle. Not sure which ones came out of this car.

The Black Buckle Black webbing Standard belts would be correct.

Thank you