The Aprilia Dorsoduro 900 headlight bulb uses a 9003 size for both high beam and low beam applications. The replacement chart covers 2017 to 2020 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 Aprilia Dorsoduro 900 uses the 9003 bulb for both high beam and low beam headlight positions across the 2017-2020 model years.
The 9003 is an ANSI-standardized bulb designation used 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 lighting functions through its two independent filaments.
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 housing.
The 9003 designation is functionally equivalent to the H4 bulb used under international IEC standards, though the two designations originate from different standardization systems and packaging may differ by market.