Plymouth Savoy License Plate Bulb Size

The Plymouth Savoy license plate light requires bulb size 67 or 63 depending on the specific application. Data for the bulb sizes covers the range from 1953 to 1964.

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
1956-1964	67
1953-1955	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

Other Locations

Additional Notes

The Plymouth Savoy license plate bulb specifications cover model years 1953-1964, with two distinct bulb types used across that span.
The bulb 67 is an ANSI-standard single-filament type with a BA15s bayonet base, rated at 12V and 8W, and is used in the Plymouth Savoy across the 1956-1964 model years.
The BA15s base on the 67 bulb is a single-contact bayonet fitting, which is not interchangeable with dual-contact bayonet bases such as the BA15d.
The 67 bulb is a lower-wattage variant of the 1156, meaning the two share the same BA15s base but differ in wattage output, making them physically compatible in the socket while differing in brightness and electrical draw.
The bulb 63 is an ANSI-standard single-filament type with a BA9s base, rated at 12V and 0.63W, and is used in the Plymouth Savoy for the 1953-1955 model years.
The BA9s base on the 63 bulb is a miniature bayonet fitting, which is physically incompatible with the BA15s base of the 67 bulb, meaning the two types are not interchangeable across model years.
The wattage difference between the two bulb types is substantial, with the 67 drawing 8W compared to the 63 at 0.63W, reflecting a significant change in the electrical specification between the 1955 and 1956 Plymouth Savoy.