1999 GMC Safari Owner's Manual - Page 16
1999 GMC Safari Manual
Page 16 highlights
yellowblue Replacing the Rear Seats 6. Lift up on the rear of the seat to remove the seat assembly from the rear latch pins. Then, pull back and lift the seat out of the vehicle. Your seat release latch lever is sprung with a two-stage mechanism. To fully release the latch, two levels of lift effort will be required. First, a low effort to overcome the first stage and then a moderate effort to fully release the latch. 1. Lower the seat into position. Make sure the front retainers are hooked onto the anchor pins. 1-10