Volkswagen Fox Dome Light Bulb Size

The Volkswagen Fox dome light requires bulb size 6411 or DE3423 depending on the specific vehicle configuration. Data for the provided bulb sizes covers the range from 1987 to 1993.

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 Size
1992-1993	DE3423
1987-1991	6411

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Volkswagen Fox dome light specifications cover model years 1987-1993 and reference two distinct bulb sizes across that span.
Both the DE3423 and 6411 are festoon-type bulbs, meaning they are cylindrical lamps that make contact at each end rather than through a screw or bayonet base.
The 6411 is rated at 12V and 5W, and its SV8.5 base designation refers to a specific end-cap fitting style with an 8.5mm cap width.
The 6411 has a 36mm length and is specified for the Volkswagen Fox across model years 1987-1991.
The DE3423 is a 41mm festoon bulb operating at 12V, and it is specified for the Fox in 1992-1993.
The 5mm difference in length between the DE3423 and the 6411 makes the two bulbs physically non-interchangeable in housings designed for a specific festoon length.
Both bulbs conform to ANSI standards applicable in the United States and Canada.
The DE3423 uses end-cap contacts, which is the standard contact method for festoon bulbs, relying on spring tension within the lamp housing to maintain the electrical connection.