The Ski-Doo GTX 550 headlight bulb uses a 9003 size for both high beam and low beam functions. The replacement chart covers 2005 to 2009 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 Ski-Doo GTX 550 uses the 9003 bulb size for both the high beam and low beam headlight positions across the 2005-2009 model years.
The 9003 is an ANSI-standard bulb recognized in the United States and Canada, operating on a 12-volt system with a dual-filament halogen design rated at 60 watts for high beam and 55 watts for low beam.
Because both the high beam and low beam positions share the same 9003 specification, a single bulb type serves both functions through its two separate filaments within one housing.
The 9003 bulb 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 and H4 bulb types share the same dual-filament halogen construction and P43t base, making them functionally interchangeable in many applications, though fitment should be confirmed against the specific socket and housing of the GTX 550 before substitution.