72 demon seatbelts?

I'm going to give it a try but I may mess up . Unless your car came from the factory bucket seats you should have enough belts for 3 people . The chrome male lap belt ends bolt to the rocker . I believe the shoulder belts also are male . The buckle ends bolt to the tunnel . The buckle for the shoulder belt has a divit in it so it can only be buckled to the shoulder strap . Sooo, if you want 2 passenger system up front you need 2 buckles bolted to the left side of tunnel and 2 buckles bolted to the right side of tunnel . If you want a 3 passenger system you need one additional buckle and male end , one on each side of tunnel . There is no provision for shoulder belt for the middle passenger . The rear seat has provisions for 3 passengers . My experience tells me 1972 belts buckles were black wrinkle finish . I could be wrong about this .