- - - 1999 GMC New Sierra 1500 Ext Cab 143.5" WB 4WD SL - Power Windows, Power Door Locks, Tilt Wheel, Cruise Control, AM/FM Stereo, Cassette Player, Tinted Glass - Deep, Additional Power Outlet(s), Air Conditioning, Bucket Seats, Heated Front Seats, Leather Seats, Wheels-Aluminum, Transmission-Overdrive-Switch, Reading Lamps-Front, Door-Passenger 3rd, Towing Package, Air Bag - Driver, Air Bag - Passenger, Air Bag On/Off Switch - Passenger, Power Steering, Brakes-ABS-4 Wheel, 4 Wheel Drive, 4 Wheel Disc Brakes, Intermittent Wipers, Rear Defrost, Daytime Running Lights