Mercedes-Benz C300 License Plate Bulb Size

The Mercedes-Benz C300 license plate light uses a 12961 bulb size according to the provided specifications for the vehicle lighting system. The available data covers a range from 2008 to 2020 for the specified component.

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 Type	Shop
2020	12961	Check Price
2008-2014	12961	Check Price

Bulb Specifications

Description	Type	Shop
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price

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Additional Notes

The Mercedes-Benz C300 uses the 12961 bulb for its license plate lighting across the 2008-2014 and 2020 model years listed in the specifications.
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 auxiliary lighting applications.
The T10 bulb operates at 12 volts and draws 5 watts, placing it in the low-wattage category typical of non-illumination lighting positions such as license plate, parking, and side marker functions.
The 12961 uses a W2.1x9.5d base, which is the standard wedge-type base for T10 bulbs. The base relies on direct contact with the socket rather than a bayonet or screw mechanism for retention.
Because the W2.1x9.5d base is a standardized wedge format, T10 bulbs sharing this base type are generally interchangeable at the socket level, though wattage and voltage ratings should match the original specification.
The consistent use of the 12961 across all listed model years of the Mercedes-Benz C300 indicates that the license plate bulb socket design remained unchanged throughout that production span.