Pontiac Chieftain License Plate Bulb Size

The Pontiac Chieftain license plate light requires bulb sizes 63 and 67 for proper illumination. Data for the lighting components covers the period from 1950 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
1955-1958	67
1950-1954	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 Pontiac Chieftain license plate bulb specifications cover model years 1950 through 1958, with two distinct bulb types used across that span: the ANSI 67 and the ANSI 63.
Both the 67 and 63 are ANSI-standard bulbs recognized in the United States and Canada, each with a single filament and operating on a 12-volt electrical system.
The bulb 67 features a BA15s bayonet base and draws 8 watts, making it a lower-wattage variant of the more widely known 1156 bulb.
The bulb 63 uses a BA9s base and draws only 0.63 watts, placing it among the smallest and lowest-power bulbs in common automotive use.
The BA15s and BA9s base types are physically incompatible with each other, meaning bulbs of one type cannot be fitted into a socket designed for the other.
The Pontiac Chieftain (1955-1958) uses the 67 bulb for the license plate position.
Model years 1950-1954 use the 63 bulb, which operates at a significantly lower wattage than the 67 adopted in later years.
The transition from the 63 to the 67 bulb occurred between the 1954 and 1955 model years, representing a change in both base type and wattage for the license plate position.