The Aprilia Dorsoduro 1200 headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers 2011 to 2012 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 9003 bulb is the sole type specified across all listed positions and years for the Aprilia Dorsoduro 1200, covering both high beam and low beam headlight applications for 2011-2012.
The 9003 is an ANSI-standard bulb recognized in the US and Canada, operating on a 12-volt system with a dual-filament construction rated at 60 watts for the high beam filament and 55 watts for the low beam filament.
Both filaments are housed within a single bulb unit, which means one 9003 bulb serves both high and low beam functions in each headlight position rather than requiring separate bulbs for each.
The 9003 uses a P43t base, a bayonet-style mount with a 43mm collar, which physically determines fitment compatibility and is not interchangeable with bulbs carrying different base types even if voltage ratings are similar.
The 9003 and H4 bulb types share the same filament configuration and base design, making them functionally equivalent in many applications, though the 9003 designation follows ANSI nomenclature while H4 follows ECE nomenclature used outside North America.