Mitsubishi 3000GT Dome Light Bulb Size

The Mitsubishi 3000GT dome light requires DE3175 and DE3022 bulb sizes depending on the specific production period for the vehicle. Information provided covers the range from 1991 to 1999.

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
1994-1999	DE3175
1992-1993	DE3022
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.	DE3022

Other Locations

Additional Notes

The Mitsubishi 3000GT dome light uses two bulb types across its model years: the DE3175 and the DE3022.
Both the DE3175 and DE3022 are ANSI-standard festoon bulbs rated at 12V, with a 31mm length and end-cap contacts, making them physically similar in form factor.
The DE3175 is specified for the 1991 and 1994-1999 model years of the 3000GT dome light position.
The DE3022 is specified for the 1992-1993 model years.
Despite sharing the same 31mm length and festoon construction, the DE3175 and DE3022 carry distinct part designations, which indicates a difference in electrical characteristics such as wattage or current draw that affects direct interchangeability.
Festoon bulbs make contact through metal caps at each end of the cylindrical housing rather than through a base socket, which is the defining trait of this bulb family.
The ANSI designation on both bulbs confirms they conform to standardized North American specifications for voltage, contact type, and physical sizing.
Substituting a DE3022 for a DE3175, or vice versa, is not supported by these specifications, as each year is assigned a specific bulb type rather than listing the two as interchangeable alternatives.