The Ski-Doo GSX 550 uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2005 through 2009 production 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 GSX 550 uses the 9003 bulb size for both high beam and low beam headlights across the 2005-2009 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to handle both high and low beam functions within one unit.
The 9003 bulb 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 flange. A bulb with a different base type is not a direct physical fit, regardless of voltage or wattage compatibility.
The 9003 designation follows the ANSI standard used in the United States and Canada. It is functionally equivalent to the H4 bulb used under European ECE standards, though the two designations originate from different regulatory systems.
Because the same 9003 bulb serves both the high beam and low beam positions on the GSX 550, replacing one headlight assembly requires only a single bulb type, and both positions draw from the same replacement part.