1993 Buick Regal Owner's Manual - Page 239

Remove the plastic nuts that secure the trunk trim over the taillights area. 3. Squeeze the bulb socket and turn it 1/4 turn to detach it from the light. 1. Remove the plastic wingnuts of the taillamp bulbs you want to replace. 2. Pull the taillight away from body carefully, to avoid scratching the paint or dropping it. 237