I believe that's a Torx 25
next to the egniton
See posting for "How do you change the headlamp bulb in a 2003 Grand Prix?" All these model years are similar in production for the headlamp assembly.
There is a fairy long black plastic rod with screwdriver slot on top and to the right of the headlight.
you don't
look in your manual
With the hood open remove the (2) two headlamp assembly bolts from the upper fascia support. Slide the headlamp assembly outward enough to release the headlamp bracket tabs from the slots in the upper fascia support. (to release the tabs from the slots on the passenger side lens move the assembly to the left when facing the engine, and when doing the drivers side lens shift the assembly to the right ) Position the headlamp assembly away from the vehicle body to access the electrical connector. Disconnect the electrical connector from the headlamp assembly. Remove the headlamp assembly from the vehicle. If you wish to change the halogen bulb: Disconnect the electrical connector from the headlamp bulb/socket. Remove the headlamp bulb/socket retainer ring from the headlamp, by turning counterclockwise. Remove the headlamp bulb/socket from the headlamp assembly. . "G" These instructions are similar from around '96 to '03 grand prix model years all trim levels.
back of assembly and twist.
behind fusebox drivers side
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Look for a small round opening between the headlight housing and the piece it attaches to. A long screwdriver should allow adjustment.