Mercedes-Benz SL65 AMG Dome Light Bulb Size

The Mercedes-Benz SL65 AMG dome light requires a bulb size of 12961 for the interior lighting system. Data for the specified component covers the range from 2007 to 2008.

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
2007-2008	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 Mercedes-Benz SL65 AMG uses the 12961 bulb for the dome light across the 2007-2008 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, which is one of the most widely used bulb types in automotive interior lighting applications.
The T10 designation refers to the bulb's tubular shape, with the number indicating its width in tenths of an inch, making it a compact form factor suited to enclosed interior housings such as dome lights.
The 12961 operates on a 12-volt electrical system at 5 watts, consistent with standard automotive low-voltage interior lighting circuits.
The W2.1x9.5d base type is a wedge-style base where the bulb's glass envelope itself acts as the retaining mechanism, requiring no separate metal shell or bayonet pins for installation.
The W2.1x9.5d designation encodes the base contact width of 2.1mm and a pin spacing of 9.5mm, which are fixed physical parameters that determine socket compatibility.
Because the T10 W2.1x9.5d base is a standardized format, aftermarket and OEM-equivalent bulbs sharing this base type are generally interchangeable with the 12961, provided they match the 12V and 5W electrical ratings.