Mercedes-Benz G550 License Plate Bulb Size

The Mercedes-Benz G550 license plate light requires a DE3423 bulb size for proper installation and function. Available data covers the period from 2009 through 2018 for the specified vehicle 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
2009-2018	DE3423	Check Price

Bulb Specifications

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

Other Locations

Additional Notes

The Mercedes-Benz G550 uses the DE3423 bulb size for the license plate position across the 2009-2018 model years.
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.
The DE3423 has a 41mm length, which is the span between its two end caps and determines physical fitment within the license plate lamp housing.
This bulb operates at 12 volts, consistent with the standard electrical systems found in passenger vehicles.
The DE3423 designation follows ANSI standards, indicating it is a regulated specification recognized across the United States and Canada.
Because the G550 uses the same DE3423 specification without variation across all ten listed model years, replacement bulbs sourced for any year within the 2009-2018 range are physically and electrically interchangeable with one another.
Festoon bulbs of the same length are sometimes sold under different part numbers by various manufacturers, so confirming the 41mm length is relevant when evaluating cross-brand substitutes for the DE3423.