The ATK GT250 uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2011 to 2014 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 bulb is the sole bulb type specified across all headlight positions in the ATK GT250 for the 2011-2014 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains separate filaments for both high and low beam operation.
Because the 9003 serves both the high beam and low beam positions in the GT250, both functions are handled by one physical bulb per headlight assembly rather than two separate bulbs.
The 9003 operates on a 12-volt electrical system and draws 60 watts on the high beam filament and 55 watts on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar, and this base type determines physical fitment into the headlight socket.
The 9003 is defined under the ANSI standard and is recognized in both the United States and Canada, making it a widely available replacement bulb in North American markets.
The 9003 and H4 bulbs share the same P43t base and dual-filament configuration, though they originate from different standardization bodies (ANSI and ECE respectively), and cross-compatibility depends on the specific socket and housing tolerances of the vehicle.