For the front belts, my 74 Charger has the C01 bolts for the side retractors at the floor and at the roof. It has the K15 bolts for the receiver ends attached near the floor hump.
For the rear belts, it has the C11 bolts for the drivers side retractor belt and for the male belt part / the center passenger receiver.
It has K11 bolts for both attaching points on the rear passenger side receiver/ center passenger male belt end and the passenger retractor.
I don't know why the two attaching points on the rear drivers side has the two C11 and the two attaching points on the passengers side has the two K11. Seat belts have not been out of car since I bought it in 1987 and are the original belts.
Terry