The Harley-Davidson FXSB Breakout headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers 2013 to 2017 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 Harley-Davidson FXSB Breakout uses the 9003 bulb size for both high beam and low beam headlight positions across the 2013-2017 model years.
The 9003 is an ANSI-standardized bulb designation recognized in the United States and Canada, distinguishing it from the internationally designated H4, which shares the same physical form but follows ECE regulatory standards.
As a dual-filament halogen bulb, the 9003 houses two separate tungsten filaments within a single glass envelope, with one filament dedicated to the high beam function and the other to 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 bulb uses a P43t base, which is a three-pronged bayonet-style mount with a 43mm collar, and this base type is what physically positions and locks the bulb within the headlight housing.
Because both the high beam and low beam positions on the FXSB Breakout share the same 9003 specification, a single bulb type serves the entire headlight assembly rather than requiring separate bulbs for each function.
The 9003 and H4 designations are not fully interchangeable in all markets despite their physical similarities, as regulatory compliance requirements differ between ANSI and ECE standards.