Ford Prefect License Plate Bulb Size

The Ford Prefect license plate light uses bulb sizes 63 and 67 depending on the specific version of the vehicle. Data for the bulb sizes covers the period from 1950 to 1957.

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 Type	Shop
1956-1957	67	Check Price
1950-1955	63	Check Price

Bulb Specifications

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

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Additional Notes

The Ford Prefect license plate bulb specifications cover the 1950-1957 model years, with two distinct bulb types used across that span.
The bulb 63 is an ANSI-standardized single-filament type fitted with a BA9s base, rated at 12V and 0.63W, and it serves the Ford Prefect across the 1950-1955 model years.
The BA9s base is a miniature bayonet cap with a 9mm body, commonly associated with low-current indicator and auxiliary lighting applications, which aligns with the 63 bulb's 0.63W rating.
The bulb 67 is an ANSI-standardized single-filament type fitted with a BA15s bayonet base, rated at 12V and 8W, and it applies to the Ford Prefect for the 1956-1957 model years.
The BA15s base features a 15mm single-contact bayonet fitting, a larger format than the BA9s, and the two base types are physically incompatible with each other's sockets.
The 67 bulb is described as a lower wattage variant of the 1156, which is itself a widely used BA15s single-filament automotive bulb rated at approximately 26.9W, making the 67 a significantly less powerful unit within the same base family.
Both the 63 and 67 are recognized under ANSI standards applicable in the United States and Canada, indicating a standardized designation system rather than a proprietary specification.
The wattage difference between the two bulb types is substantial: the 63 draws 0.63W while the 67 draws 8W, meaning the two are not interchangeable despite both being single-filament 12V bulbs.