Chevrolet Fleetline License Plate Bulb Size

The Chevrolet Fleetline uses a 63 bulb size for the license plate light component. Data for the specific lighting requirements covers the period from 1950 to 1952.

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
1950-1952	63	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 0.63W.	63	Check Price

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Additional Notes

The ANSI 63 bulb is the sole license plate bulb type listed for the Chevrolet Fleetline, covering the 1950-1952 model years.
The ANSI 63 is a single-filament bulb, meaning it serves one lighting function rather than combining multiple functions such as brake and tail lighting into a single unit.
The 63 bulb operates on a 12-volt electrical system, consistent with the 12V automotive standard that became prevalent in passenger vehicles during this era.
At 0.63 watts, the 63 bulb draws very little power, which reflects the minimal illumination requirement of a license plate light compared to other vehicle lighting positions.
The BA9s base is a miniature bayonet fitting with a 9mm cap body. It is a single-contact base, which corresponds to the single-filament design of the 63 bulb.
The ANSI designation indicates the 63 bulb conforms to standards recognized in both the United States and Canada, placing it within a North American fitment context.
Because only one bulb type is specified across all three listed model years of the Fleetline, the license plate bulb socket and fitment remained unchanged throughout the 1950-1952 production run.