The Ducati Monster S2 headlight bulb uses a 9003 size for both high beam and low beam applications. The replacement chart covers vehicle production years spanning 2005 to 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 bulb type is specified for both the high beam and low beam headlight positions across all listed model years of the Ducati Monster S2.
The 9003 bulb is a dual-filament halogen type, meaning a single bulb contains separate filaments for both high and low beam output, which accounts for its use in both headlight positions on this motorcycle.
The 9003 bulb operates at 12 volts and carries a standard wattage rating of 60 watts on the high beam filament and 55 watts on the low beam filament.
The Ducati Monster S2 (2005-2008) uses the 9003 bulb size for both headlight functions without variation across any of the four listed model years.
The 9003 bulb is physically identical to the H4 bulb and the two are cross-compatible in most applications, sharing the same three-pin P43t base.
Because a single 9003 bulb serves both the high beam and low beam positions, replacing one headlight bulb effectively addresses both lighting functions simultaneously.
The consistent 9003 fitment across the 2005-2008 model range indicates that parts sourced for one of these years are applicable to the others without modification.