Jaguar Vanden Plas License Plate Bulb Size

The Jaguar Vanden Plas license plate light uses bulb sizes 12961 and DE3423 depending on the specific version of the vehicle. Available data for the lighting components covers the range from 1982 to 2009.

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 Type	Shop
2007-2009	12961	Check Price
1982-2006	DE3423	Check Price

Bulb Specifications

Description	Type	Shop
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423	Check Price

Other Locations

Additional Notes

The Jaguar Vanden Plas license plate bulb specification covers model years 1982-2009, with two distinct bulb types required across that span.
Model years 1982-2006 use the DE3423, an ANSI-standard festoon bulb with a 41mm length and end-cap contacts operating at 12V. Its festoon design means the bulb is held in place by spring-loaded contacts at each end rather than a socket base.
The DE3423 designation follows ANSI standards recognized in both the United States and Canada, indicating a standardized form factor shared across many vehicle manufacturers during that period.
Model years 2007-2009 use the 12961, a Philips-designated miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, rated at 12V and 5W. The wedge base is retained by friction within its socket rather than by end-cap contacts.
The T10 designation of the 12961 refers to a tubular bulb roughly 10/8 of an inch wide, a common sizing convention in miniature automotive lighting.
The W2.1x9.5d base specification of the 12961 describes a wedge-type base 2.1mm wide at its contact point and 9.5mm in depth, defining the precise socket geometry required for fitment.
The 12961 and DE3423 are not interchangeable. They differ in base type, physical form, and socket design, meaning the housing in the Vanden Plas changed between the 2006 and 2007 model years to accommodate the wedge-style fitting.
The DE3423 specification does not include a listed wattage rating in the provided data, whereas the 12961 is explicitly rated at 5W, a typical output for license plate illumination in its category.
Both bulb types operate on a 12V electrical system, consistent with standard automotive DC voltage across all listed model years.
Because the DE3423 is an ANSI-standardized part, it is produced by multiple manufacturers, while the 12961 is a Philips part number and may have equivalent cross-reference numbers under other brands sharing the same T10 wedge specification.