Lamborghini Diablo License Plate Bulb Size

The Lamborghini Diablo license plate light requires a DE3423 bulb size for proper installation and function within the rear exterior lighting assembly. Available data covers the production range from 1990 through 2001 for the specified vehicle and 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
1990-2001	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 Lamborghini Diablo uses the DE3423 bulb size for the license plate position across all listed model years, spanning 1990-2001.
The DE3423 is classified as a festoon bulb, a cylindrical form factor that mounts horizontally between two spring-loaded end-cap contacts rather than using a traditional socket base.
The DE3423 has a 41mm length, which is the critical physical specification that determines fitment within the license plate lamp housing.
End-cap contacts on the DE3423 mean electrical connection is made at both ends of the bulb body, a design that distinguishes festoon types from bayonet or wedge-base alternatives.
The DE3423 operates at 12 volts, consistent with the standard automotive electrical system voltage found in production road vehicles.
The DE3423 carries an ANSI designation, meaning it conforms to a standardized specification recognized across the United States and Canada, which governs its physical and electrical properties.
Because the DE3423 specification remained unchanged across the entire 1990-2001 production run of the Diablo, the license plate lamp housing design was consistent throughout that period.
Festoon bulbs of the same length are sometimes cross-compatible, but the DE3423 designation specifically defines the electrical rating alongside the 41mm length, and substitutions with different ANSI codes may not share identical ratings even if physically similar in size.