Oldsmobile 2000 Silhouette - Manual (Page 66)

1-54
Center Passenger Position
(Bench Seat)
Lap Belt
If your vehicle has a third row rear bench seat, someone
can sit in the center position.
When you sit in the center position of the bench seat,
you have a lap safety belt, which has no retractor.
To make the belt longer, tilt the latch plate and pull it
along the belt.