66 Dart shoulder belts?

I have a 66 valiant. I installed the bucket seats from a 97 Pontiac Bonneville in the front. They have the seat belt buckle made into the seat, so I got the shoulder belt too. If you tear the enterior out of the Bonneville the seat belt spool is in a black plastic case. It is not computer controled either. Bolt floor peices using existing bolts and holes from your old seat belts, and work on the upper mount on the post. It's not hard . I think I paid $100 for the seats and $20 for the seat belts.