1999 GMC Sierra 1500 Pickup Owner's Manual - Page 40

Seats & Safety Belts Center Passenger Positions (Except Extended Cab Rear Seat) K2128 If your vehicle has front and rear bench seats, someone can sit in the center positions. Center Passenger Position (Front Seats) Center Passenger Position (Four Door Models Rear Seat) AN1450sJ I When you sit in thecenterseatingposition, you havealapsafetybelt,which hasnoretractor. To makethebeltlonger, tilt thelatchplateandpull it alongthe belt. 1-26