Chevrolet Del Ray High Beam Indicator Bulb Size

The Chevrolet Del Ray high beam indicator requires a bulb size of 53 for the specified lighting component. Data for the bulb size covers the range from 1957 to 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
1957-1958	53

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	53

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Additional Notes

The bulb size 53 is an ANSI-standardized type used in both the United States and Canada. It operates on 12 volts and draws 2 watts, placing it in the low-wattage range typical of indicator and warning light applications.
The 53 bulb uses a BA9s base, a miniature bayonet fitting with a 9mm cap. This base type is common in instrument panel and indicator light sockets of mid-20th century vehicles.
The Chevrolet Del Ray uses the 53 bulb for the high beam indicator across the 1957-1958 model years, meaning the same bulb size applies to both production years without variation.
Because the 53 is a single-filament bulb, it serves a fixed, non-switchable function. In a high beam indicator circuit, the single filament either illuminates or does not, with no secondary brightness level.
The BA9s base is not interchangeable with other common miniature bayonet bases, such as the BA15s or BAY15d. A bulb with a different base type would not seat correctly in a socket designed for the 53.