The Mercedes-Benz ML450 parking light requires a bulb size of 12961 for the specific lighting assembly. Data for the bulb size covers the range from 2010 to 2011.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz ML450 uses the 12961 bulb for the front parking light across the 2010-2011 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base.
The T10 form factor is a small cylindrical bulb type widely used in low-intensity automotive lighting positions such as parking lights, side markers, and license plate lights.
The W2.1x9.5d base designation describes a wedge-style base with a 2.1mm wire contact width and a 9.5mm insertion depth, which determines physical socket compatibility.
The 12961 operates at 12 volts and 5 watts, placing it in the low-wattage range typical of indicator and position lighting rather than primary illumination.
Because the W2.1x9.5d base is a standardized wedge fitting, other T10 bulbs sharing that base type are generally interchangeable at the socket level, though wattage and voltage ratings should match the original specification to avoid electrical or fitment issues.