The Harley-Davidson FXCW Rocker headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers 2008 to 2011 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 headlight bulb type listed across all model years of the Harley-Davidson FXCW Rocker, covering the 2008-2011 production run.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains separate filaments for both high and low beam operation rather than requiring two distinct bulbs.
The Harley-Davidson FXCW Rocker uses the same 9003 bulb position for both its high beam and low beam headlight functions, which is consistent with the dual-filament nature of the 9003 specification.
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 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type determines physical fitment and is not interchangeable with bulbs carrying different base designations.
The 9003 designation follows the ANSI standard as used in the United States and Canada. It is functionally equivalent to the H4 bulb used under international ECE standards, though the designations originate from different regulatory frameworks.
Because the 9003 and H4 share the same physical construction and P43t base, they are generally considered interchangeable in practice, though the specifications reference only the ANSI 9003 designation for this vehicle.