Mercedes-Benz SLR McLaren License Plate Bulb Size

The Mercedes-Benz SLR McLaren license plate light uses a DE3423 bulb size for illumination. Data for the specific bulb application covers the range from 2005 to 2009.

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
2005-2009	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 sole license plate bulb size listed for the Mercedes-Benz SLR McLaren across the 2005-2009 model years.
The DE3423 follows the ANSI standard, meaning it conforms to a North American specification recognized in both the United States and Canada.
The DE3423 is a festoon-type bulb, a form factor characterized by a cylindrical body held between two end-cap contacts rather than a screw or bayonet base.
The bulb has a length of 41mm, which is a critical fitment factor, as festoon bulbs must physically span the contact points of the housing to make an electrical connection.
The DE3423 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
Because the DE3423 uses end-cap contacts, any substitute bulb intended for the SLR McLaren's license plate position must share that same contact configuration to seat correctly in the housing.
The 41mm length is a defining fitment specification for the DE3423; festoon bulbs of differing lengths, such as 36mm or 44mm variants, are not interchangeable even if they share the same voltage rating.