Harley-Davidson FXDX Dyna Super Glide Sport Headlight Bulb Size
The Harley-Davidson FXDX Dyna Super Glide Sport uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1999 to 2005 model 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 is the sole bulb type specified for the Harley-Davidson FXDX Dyna Super Glide Sport across all listed headlight positions and model years.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains separate filaments for both high beam and low beam operation, which accounts for its use in both headlight positions on this motorcycle.
The bulb operates on a 12-volt electrical system and draws 60 watts on the high beam filament and 55 watts on the low beam filament.
The 9003 uses a P43t base, a bayonet-style mount with a 43mm collar that physically determines fitment and is not interchangeable with bulbs carrying different base types, regardless of voltage or wattage similarity.
The 9003 designation follows the ANSI standard used in the United States and Canada. It is electrically and functionally equivalent to the European ECE-rated H4 bulb, though the two designations originate from different regulatory frameworks.
The 9003 specification applies uniformly across the 1999-2005 model years for both the high beam and low beam headlight positions on this motorcycle.