KTM 640 Duke II License Plate Bulb Size

The KTM 640 Duke II uses a 12961 bulb size for the license plate light, with this specific bulb designation representing the replacement component for that location. The replacement chart covers vehicle production spanning 1999 to 2006, detailing bulb size specifications across the model's manufacturing range.

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
1999-2006	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 KTM 640 Duke II uses the 12961 bulb for its license plate light across all listed model years, spanning 1999-2006.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor.
T10 refers to the bulb's tubular shape, with the number indicating a width of 10 millimeters.
The 12961 operates on a 12-volt electrical system at 5 watts, which is consistent with standard low-draw auxiliary lighting on motorcycles.
The base type is W2.1x9.5d, a wedge-style base that is retained by friction rather than a bayonet or screw mechanism.
The W2.1x9.5d designation specifies the contact wire width at 2.1 millimeters and the base length at 9.5 millimeters, which determines physical fitment into the socket.
Because the 12961 is a wedge base bulb, it is not interchangeable with bayonet-base types such as the BA9s or BAY9s, even when wattage ratings are similar.
The T10 wedge format is widely used across automotive and motorcycle auxiliary lighting, meaning aftermarket equivalents from other manufacturers are generally available under different part numbers but must share the W2.1x9.5d base and 12V/5W ratings to be compatible.