Mercedes-Benz SL55 AMG License Plate Bulb Size

The Mercedes-Benz SL55 AMG license plate requires a DE3423 bulb size for the lighting assembly. Data for the specific component covers the range from 2003 to 2008.

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
2003-2008	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 DE3423 is the specified license plate bulb for the Mercedes-Benz SL55 AMG across the 2003-2008 model years.
The DE3423 follows the ANSI standard, meaning it conforms to a recognized North American specification used in both the United States and Canada.
This bulb is a festoon type, which is a cylindrical form factor that seats between two end-cap contacts rather than using a base socket.
The festoon body measures 41mm in length, which is a critical fitment factor, as festoon bulbs of differing lengths are not interchangeable even when voltage ratings match.
The DE3423 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
Because the same bulb size applies uniformly across all six listed model years, no year-specific fitment distinctions exist within this generation of the SL55 AMG for the license plate position.