Pontiac 2005 Bonneville Owner's Manual page 330

5. Tip the headlamp assembly and while pressing the
release, turn the bulb and socket counterclockwise
to remove them.
6. Replace the bulb and reinstall the socket. Then
reconnect the wiring harness to the lamp assembly.
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7. Slide the lamp assembly back into place by
lining up the track on the bottom of the assembly
with the guide on the vehicle. Then connect
the outboard snap and secure the lamp assembly
with the two bolts.