Mercury Medalist License Plate Bulb Size

The Mercury Medalist license plate light requires a 67 bulb size for proper installation and function. Data for the specified component covers the period from 1956 through 1958.

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
1956-1958	67

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67

Other Locations

Additional Notes

The bulb size 67 is the license plate bulb for the Mercury Medalist across the 1956-1958 model years.
The 67 bulb follows the ANSI standard, making it applicable to both the United States and Canadian markets.
It is a single-filament bulb, meaning it serves one lighting function rather than switching between two brightness levels as a dual-filament bulb would.
The 67 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount that locks into its socket with a twist.
Operating at 12 volts and 8 watts, the 67 is a lower-wattage variant of the 1156 bulb, which shares the same BA15s base type but draws more power.
Because the 67 and 1156 share the same base, physical fitment into the socket is possible with either bulb, though the difference in wattage means they are not electrically identical replacements for one another.