Suzuki Motorcycle S40 Boulevard uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 2005 to 2019 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 Suzuki Motorcycle S40 Boulevard uses the 9003 bulb size for both the high beam and low beam headlight positions across the 2005-2019 model years, with the exception of 2010, for which no specification is listed.
The 9003 is an ANSI-standardized bulb type recognized in the United States and Canada, distinguishing it from ECE-standard equivalents used in other markets.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments, one serving the high beam function and the other serving the low beam function.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W for the high beam filament and 55W for the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type is a physical fitment factor that determines whether a replacement bulb will seat correctly in the housing.
Because both the high beam and low beam positions share the same 9003 specification on the S40 Boulevard, a single bulb type serves both lighting functions through its dual-filament design rather than requiring two separate bulb types.
The 9003 is functionally equivalent to the HB2 designation and is also cross-referenced with the H4 bulb type, though H4 is an ECE designation and subtle base tolerance differences between the two standards can affect fitment in some housings.