Alfa Romeo 164 License Plate Bulb Size

The Alfa Romeo 164 license plate light requires a DE3423 bulb size for proper installation and function. Data for the specific component covers the range from 1991 to 1995.

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
1991-1995	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 Alfa Romeo 164 uses the DE3423 bulb for the license plate position across all listed model years, spanning 1991-1995.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in form and makes electrical contact through metal caps at each end rather than through a base pin or wedge.
The DE3423 has a 41mm length, which is the critical fitment factor for festoon bulbs, as the housing clips must align with the end caps for the bulb to seat correctly.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
The DE3423 designation follows ANSI standards, meaning it is a specification recognized across the United States and Canada, and equivalent bulbs from different manufacturers sharing this designation are expected to meet the same performance and physical criteria.
Because the DE3423 is an ANSI-standardized festoon bulb, substitution with another bulb of the same designation from a different brand is generally considered interchangeable, provided the 41mm length and end-cap contact design are maintained.