Mercedes-Benz CLK350 License Plate Bulb Size

The Mercedes-Benz CLK350 license plate bulb uses a DE3423 size. The replacement chart covers 2006 to 2009 vehicle production years with corresponding bulb specifications.

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
2006-2009	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 CLK350 uses the DE3423 bulb for the license plate position across the 2006-2009 model years.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in form and makes electrical contact through metal caps at both ends rather than through a base socket.
The DE3423 operates at 12 volts, which is consistent with standard automotive electrical systems.
The bulb has a 41mm length, which is the critical fitment factor for festoon bulbs, as the housing retains the bulb by tension between its two end contacts.
The DE3423 carries ANSI designation, indicating it conforms to standardized specifications recognized in the United States and Canada.
Because festoon bulbs are retained by length rather than by a keyed base, substituting a festoon bulb of a different length risks poor contact or failure to seat correctly in the CLK350 license plate housing.