2005 Pontiac GTO Owner's Manual - Page 237

4. Turn the appropriate bulb socket counterclockwise while holding the assembly, to release it from the housing. 5. Remove the bulb from the socket by pushing it in and turning it counterclockwise. The turn signal bulb must have amber colored glass. 6. Install the new bulb into the bulb socket by pushing it into the socket and turning it clockwise. 7. Install the bulb socket into the lamp housing, ensuring that the socket locks securely into place. 8. Reinstall the lamp assembly so that the clips are seated correctly. Fit the housing to the body, so that the locating pegs snap into the clips. 9. Install and tighten the screws to secure. Replacement Bulbs Exterior Lamp Back-up Lamp Front Turn Signal and Parking Lamp Headlamps High-Beam Low-Beam Rear Turn Signal Stoplamp and Taillamp Bulb Number 1156 1157NA H9 H11LL 1156NA 1157 For replacement bulbs not listed here, contact your dealer. 5-51