Buick 2000 Regal Owner's Manual page 280

Once the horizontal aim is adjusted, then adjust the
vertical aim.
1. Turn the horizontal aiming screw until the indicator
is lined up with zero.
2. Turn the vertical aiming screw until the level bubble
is lined up with zero.
Front Parking and Turn Signal Lamp
1. Remove the headlamp assembly. Refer to the
removal procedure earlier in this section.
2. Remove the rubber bulb access cover.
3. Twist the sidemarker lamp socket counterclockwise
and pull from the headlamp assembly.
4. Holding the base of the bulb, pull the bulb from
the socket.
5. Push the new bulb into the socket.
6. Reverse these steps to reinstall the lamp assembly.
Center High-Mounted Stoplamp
1. Open the trunk.
2. Reach through the access opening in the trunk.
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