Mercedes-Benz S65 AMG License Plate Bulb Size

The Mercedes-Benz S65 AMG license plate light utilizes 12961 and DE3423 bulb sizes for the exterior illumination system. Data for the specified lighting components covers the production range from 2006 through 2013.

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
2007-2013	12961
2006	DE3423

Bulb Specifications

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

Other Locations

Additional Notes

The Mercedes-Benz S65 AMG uses the 12961 bulb for its license plate light across the 2007-2013 model years, while the 2006 model year uses the DE3423 bulb instead.
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 wedge form factor means the bulb is held in place by friction against the socket walls rather than by a locking twist or external retaining clip.
The W2.1x9.5d base designation describes the wedge base width and pin spacing, which determines physical socket compatibility.
The DE3423 is an ANSI-standardized festoon bulb used in the United States and Canada, measuring 41mm in length and making electrical contact through metal end caps at each end of the bulb body.
The festoon and wedge base types are not interchangeable, as each requires a different socket design to make proper electrical contact.
Both the 12961 and DE3423 operate on a 12-volt electrical system, consistent with standard automotive low-voltage architecture.
The 2006 S65 AMG requires the DE3423 festoon type, meaning a 12961 wedge bulb sourced from a 2007-2013 vehicle would not fit the 2006 socket without modification.