Mitsubishi Galant Dome Light Bulb Size

The Mitsubishi Galant dome light utilizes DE3175 and DE3021 bulb sizes for interior illumination across various production versions. Provided information covers a specific time range from 1989 through 2012.

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
1994-2012	DE3175
1992-1993	DE3021
1989-1991	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3021

Other Locations

Additional Notes

The Mitsubishi Galant dome light uses two bulb sizes across its 1989-2012 model range: the DE3175 and the DE3021.
Both the DE3175 and DE3021 are ANSI-standardized festoon bulbs rated at 12 volts, with a 31mm length and end-cap contacts.
The DE3175 is the dominant fitment, covering the Mitsubishi Galant from 1989 through 2012, with the exception of the 1992 and 1993 model years.
Festoon bulbs seat into a spring-loaded holder by pressing the end caps against two contact points at either end of the housing, rather than using a bayonet or wedge base.
The 1992 and 1993 Galant models use the DE3021 instead of the DE3175.
Although the DE3175 and DE3021 share the same 31mm length, end-cap contact design, and 12V rating, they are distinct part numbers and are not confirmed as interchangeable by these specifications.
The 1991 Galant uses the DE3175, while the immediately following 1992 and 1993 models use the DE3021, after which the 1994 model returns to the DE3175.
The ANSI designation on both bulbs indicates conformance to a standardized specification recognized across the United States and Canada, meaning equivalent bulbs from different manufacturers sharing the same ANSI code are generally considered direct replacements.