Ducati Monster S4 License Plate Bulb Size

The Ducati Monster S4 license plate bulb uses a 12961 size bulb for illumination. The replacement chart covers 2004 to 2007 model years with corresponding bulb 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
2004-2007	12961

Bulb Specifications

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

Other Locations

Additional Notes

The Ducati Monster S4 uses the 12961 bulb for the license plate position across the 2004-2007 model years.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts.
The T10 designation refers to the bulb's tubular shape, with the number indicating a width of 10 millimeters.
The W2.1x9.5d base is a wedge-type fitting, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
At 5 watts, the 12961 is a low-power bulb suited to small illumination tasks such as license plate lighting.
The W2.1x9.5d base is a standardized fitting, and the 12961 is interchangeable with other T10 wedge bulbs sharing the same base type and electrical ratings.