Harley-Davidson XL1200C Sportster 1200 Custom Tail Light Bulb Size

Harley-Davidson XL1200C Sportster 1200 Custom tail light uses a 3157 bulb size. The replacement chart covers 2005 to 2009 model years with bulb size specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2005-2009	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

Other Locations

Additional Notes

The 3157 is the specified tail light bulb for the Harley-Davidson XL1200C Sportster 1200 Custom across the 2005-2009 model years.
The 3157 follows the ANSI standard, which is the recognized bulb classification system used in the United States and Canada.
As a dual-filament bulb, the 3157 operates two separate filaments within a single housing, one rated at 27W for braking and one at 7W for running light functions.
The T25 designation refers to the wedge-style base of the bulb, which seats directly into a socket without requiring a separate bayonet or screw fitting.
The 3157 operates on a 12V electrical system, consistent with standard automotive and motorcycle electrical architectures.
The 3157 and 3156 share the same physical form factor, but the 3156 is a single-filament variant. Substituting a 3156 in a dual-filament application would result in the loss of one lighting function.