The Harley-Davidson XL1200X Forty-Eight uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2010 through 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 Harley-Davidson XL1200X Forty-Eight uses the 9003 bulb size for both the high beam and low beam headlight positions across the full 2010-2020 model range.
The 9003 is an ANSI-standardized bulb designation recognized in the United States and Canada, making it a regionally defined specification rather than a universal global standard.
This bulb is a dual-filament halogen type, meaning a single bulb unit contains two separate filaments to serve both the high beam and low beam functions within one housing.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The base type for the 9003 is P43t, a designation that refers to the physical connector and mounting interface of the bulb, which must match the socket in the headlight housing for proper fitment.
The 9003 is functionally equivalent to the H4 bulb, which shares the same dual-filament halogen design and P43t base, though the 9003 designation follows ANSI standards while H4 follows ECE standards used in other regions.
Because both beam positions share the same 9003 specification across all listed years, a single bulb type serves the entire headlight assembly on the XL1200X Forty-Eight without requiring separate part numbers for each function.