Mitsubishi Diamante Map Light Bulb Size

The Mitsubishi Diamante map light requires bulb size 168 or 12961 or DE3175 depending on the specific vehicle configuration. Available information covers the range from 1995 through 2004.

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
1997-2004	168
1996	12961 (For vehicle with Sun-Roof)
1996	DE3175 (For vehicle without Sun-Roof)
1995	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The Mitsubishi Diamante uses the 168 bulb for the map light across the 1997-2004 model years.
The 168 is an ANSI-standardized miniature wedge bulb in the T10 form factor, rated at 12V and 4.9W.
The T10 wedge form factor uses a pinched glass base that inserts directly into a wedge-type socket, requiring no separate metal base or locking mechanism.
The 1996 Mitsubishi Diamante has two distinct map light bulb fitments depending on whether the vehicle was built with or without a sunroof.
The sunroof-equipped 1996 Diamante takes the 12961, a Philips-numbered T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The W2.1x9.5d base designation describes a wedge-type base with a 2.1mm wire contact width and a 9.5mm insertion depth, which is a standard T10 wedge specification.
The non-sunroof 1996 Diamante and the 1995 model both use the DE3175, an ANSI-standardized festoon bulb with a 31mm length and end-cap contacts rated at 12V.
Festoon bulbs make electrical contact through metal caps at each end of the glass tube, which is a physically distinct mounting style from the wedge base used by the 168 and 12961.
The 168 and 12961 share the T10 wedge form factor and both operate at 12V, but the 168 is identified by an ANSI standard number while the 12961 is a Philips part number, and the two differ slightly in wattage at 4.9W versus 5W respectively.
Substituting a festoon-type bulb such as the DE3175 in a socket designed for a wedge-type bulb, or vice versa, would result in an incompatible fitment due to the fundamentally different base and contact configurations.