Mercedes-Benz GL450 Map Light Bulb Size

The Mercedes-Benz GL450 map light requires a bulb size of 12961 for proper installation and function within the interior lighting system. The provided data covers a range of years from 2007 to 2016.

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
2013-2016	12961 (Rear)
2007-2012	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 GL450 uses the 12961 bulb across all ten model years covered in the specifications, spanning 2007-2016.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, rated at 12 volts and 5 watts.
The T10 designation refers to a tubular bulb roughly 10mm wide, and the W2.1x9.5d base describes a wedge-style base that friction-fits directly into its socket without a separate locking mechanism.
At 5 watts, the 12961 is a low-power incandescent bulb, consistent with interior courtesy and map light applications.
For the 2013-2016 GL450, the specifications designate the 12961 bulb specifically for the rear map light position, indicating a positional distinction within the cabin for those model years.
The 2007-2012 model years carry no positional qualifier in the specifications, listing the 12961 without a front or rear designation.
The W2.1x9.5d wedge base is a standardized fitting, meaning the 12961 shares physical compatibility with other T10 wedge bulbs using the same base type, though electrical ratings should be matched before substitution.
Because the 12961 is a Philips-specific part number, equivalent bulbs from other manufacturers are typically cross-referenced by the T10 form factor and W2.1x9.5d base rather than by this number alone.