2003 Buick Lesabre seat belt

Hello well what you want to do is take the bottom part of the back seat out all you should have to do is pull up on the part where you sit and it will come up. That will then give you access to the seat belts that are attached to the floor of the car. The seat belts should be held in by torx bolts they will have a star shaped head on top and after the bolt comes out, you will then have access to slide the plastice over the belt. I hope this will help you.