Buell X1 Lightning License Plate Bulb Size

The Buell X1 Lightning uses a 12961 bulb size for the license plate assembly. The replacement chart covers vehicle production spanning 1999 to 2002.

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
1999-2002	12961

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

The Buell X1 Lightning uses the 12961 bulb for the license plate position across the 1999-2002 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base.
The T10 designation refers to a tubular bulb approximately 10mm wide, commonly found in low-intensity automotive lighting positions such as license plate, parking, and courtesy lights.
The W2.1x9.5d base is a wedge-type connector, meaning the bulb is held in place by friction from its plastic base rather than by a bayonet or screw mechanism.
The 12961 operates at 12 volts and 5 watts, which is consistent with standard low-power auxiliary lighting circuits in motorcycles of this era.
Because the 12961 carries a specific Philips part number, substitutions should share the same T10 form factor, W2.1x9.5d base, 12V rating, and 5W output to maintain fitment and circuit compatibility.