Ford GT License Plate Bulb Size

The Ford GT license plate light requires a DE3423 bulb size for the rear illumination system. Data for the specific component covers the range from 2005 to 2006.

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
2005-2006	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 a festoon-type bulb, meaning it is cylindrical in shape with flat metal contacts at each end rather than a screw or wedge base. It measures 41mm in length and operates at 12 volts.
The DE3423 follows the ANSI standard, which is the specification framework used across the United States and Canada, indicating the bulb conforms to a defined set of electrical and physical parameters recognized in North American markets.
The Ford GT uses the DE3423 bulb for the license plate position across its 2005-2006 model years, representing the full known production span covered by these specifications.
End-cap contacts, as found on the DE3423, make physical and electrical connection at both tips of the bulb. This contact style requires a holder designed specifically for festoon fitment, meaning wedge-base or bayonet-base replacements are not interchangeable with this position.
The 41mm length of the DE3423 is a critical fitment factor. Festoon bulbs of differing lengths, such as the common 36mm or 44mm variants, would not seat correctly in the Ford GT license plate housing even if the voltage rating matches.