Mercedes-Benz R350 License Plate Bulb Size

The Mercedes-Benz R350 license plate light requires a DE3423 bulb size for proper installation and function. Available information covers the period from 2006 through 2012 for the specified vehicle.

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
2006-2012	DE3423	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423	Check Price

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Additional Notes

The Mercedes-Benz R350 uses the DE3423 bulb for the license plate light across all listed model years, spanning 2006-2012.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket or pins.
The DE3423 has a length of 41mm, which is a standard festoon size widely used in European and North American vehicle applications.
This bulb operates at 12 volts, consistent with the standard electrical systems found in passenger vehicles.
The DE3423 designation follows ANSI standards recognized in both the United States and Canada, indicating a defined and regulated specification for the bulb's electrical and physical characteristics.
The end-cap contact design of the DE3423 requires a festoon-style holder; bulbs with pin-type or wedge-type bases are not interchangeable with this fitment.
When replacing the license plate bulb on the R350 (2006-2012), the 41mm length is a critical fitment factor, as festoon bulbs of different lengths such as 36mm or 44mm will not seat correctly in the same holder.