Ford Mainline License Plate Bulb Size

The Ford Mainline license plate light requires bulb size 67 or 63 depending on the specific application. Data for the lighting components covers the period from 1952 through 1956.

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	67
1952-1955	63

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 0.63W.	63

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Additional Notes

The Ford Mainline used two distinct bulb types across its license plate lighting across the 1952-1956 model years: the type 63 and the type 67, both governed by ANSI standards applicable in the US and Canada.
The type 63 bulb operates at 12 volts and draws 0.63 watts, making it a very low-power lamp by automotive standards.
The type 63 uses a BA9s base, a small single-pin bayonet fitting that is not interchangeable with the larger BA15s bayonet base found on the type 67.
The type 67 operates at 12 volts and draws 8 watts, a notably higher output than the type 63.
The type 67 is a single-filament bulb sharing its BA15s bayonet base with the more widely known 1156 bulb, though it is a lower-wattage variant of that type.
The Ford Mainline (1952-1955) specifies the type 63 for license plate illumination, while the 1956 model year specifies the type 67, indicating a base and wattage change between those production years.
Because the type 63 uses a BA9s base and the type 67 uses a BA15s base, the two bulbs are physically incompatible and cannot be substituted for one another.