The Moto Guzzi California Vintage headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers 2006 to 2010 production specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 is an ANSI-standard dual-filament halogen bulb rated at 12 volts, with a high beam filament drawing 60 watts and a low beam filament drawing 55 watts, fitted with a P43t base.
The Moto Guzzi California Vintage uses the 9003 bulb for both the high beam and low beam headlight positions across the 2006-2010 model years.
Because a single 9003 bulb serves both beam functions through its two filaments, the high beam and low beam positions share one physical bulb rather than separate units.
The 9003 designation follows ANSI standardization applicable in the United States and Canada, which defines the bulb's base type, voltage, wattage, and filament configuration.
The P43t base is a bayonet-style fitting with a 43mm collar, and correct base compatibility is a required condition for proper installation in the headlight housing.
The 9003 and H4 bulbs share the same dual-filament halogen construction and P43t base, though they originate from different standardization systems, ANSI and ECE respectively, and are not guaranteed to be interchangeable in all housings without confirming fitment.