1999 GMC Safari Owner's Manual - Page 283
1999 GMC Safari Manual
Page 283 highlights
yellowblue Headlamps Sealed Beam Lamps 1. Remove the four retainer screws and the retainer. 2. Pull the connector out and unplug the lamp. 3. Plug the new lamp into the connector. 4. Reverse Steps 1 and 2 to reinstall the headlamp. 6-37