The Mercedes-Benz GL350 parking light requires a bulb size of 12961 for the lighting system. Data for the specific component covers the range from 2010 to 2012.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz GL350 uses the 12961 bulb for the front parking light across the 2010-2012 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, rated at 12 volts and 5 watts.
The T10 designation refers to a tubular bulb with a width of approximately 10mm, commonly found in low-intensity automotive lighting positions such as parking lights.
The W2.1x9.5d base type is a wedge-style connector, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
At 5 watts, the 12961 operates as a low-power incandescent bulb, consistent with its role as a parking or position light rather than a primary illumination source.
The W2.1x9.5d base specification is a standardized international designation, and substituting a bulb with a different base type would result in an incompatible fit for the GL350 front parking light socket.