Note: This section shows only the removal of the rear seat and the middle and left rear seat belt buckles. The right rear seat and seat belt buckle are removed in the same way.
1. Remove the rear seat back (see "Removal and installation the rear seat").
2. Remove the rear pillar trim (see "Removal and installation of interior trim".
3. Remove the lower belt fastening bolt...
4. ...and move the belt with the lower sprinkling to the side.
5. Remove the inertia reel mounting screw...
6. ...and remove the coil from the body cavity.
7. Install the rear seat belt and all parts in the reverse order of removal.
The article was borrowed from the website ChevyMan