Mitsubishi Mighty Max License Plate Bulb Size

The Mitsubishi Mighty Max license plate light requires bulb size 12821 or 67 depending on the specific configuration. Available data covers the period from 1983 through 1996.

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
1992-1996	12821
1983-1987	67

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12821
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67

Other Locations

Additional Notes

The Mitsubishi Mighty Max uses two distinct bulb types for the license plate position across its production span: the 12821 for model years 1992-1996 and the 67 for model years 1983-1987.
The 12821 is a Philips part number designating a T10 miniature wedge bulb. It operates at 12 volts and 5 watts, and its W2.1x9.5d base is a wedge-type fitting that requires no rotation to install or remove.
The 67 is an ANSI-standardized bulb recognized across the United States and Canada. It uses a BA15s single-contact bayonet base, operates at 12 volts, and draws 8 watts.
The BA15s bayonet base of the 67 bulb is mechanically incompatible with the W2.1x9.5d wedge socket used by the 12821, meaning the two bulb types are not interchangeable despite both serving the same license plate function.
The 67 bulb is a lower-wattage variant of the 1156. While both share the BA15s bayonet base, the 1156 operates at a higher wattage, and substituting it in a socket rated for the 67 carries a risk of exceeding the socket's thermal tolerance.
The 12821 at 5 watts draws less current than the 67 at 8 watts, reflecting a difference in power consumption between the two generations of the Mighty Max license plate circuit.