Chevrolet Del Ray Clock Light Bulb Size

Chevrolet Del Ray clock light bulb sizes include 57 and 67, with the bulb specifications varying by production year. The replacement chart covers 1957 to 1958 model years and documents the corresponding clock light bulb sizes for each year.

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
1958	57
1957	67

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W.	57
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67

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Additional Notes

The Chevrolet Del Ray uses two different clock light bulb sizes across its production years, with the 1957 model year fitted with a type 67 bulb and the 1958 model year fitted with a type 57 bulb.
Both the type 57 and type 67 are ANSI-standardized bulbs recognized in the US and Canada, and both operate on a 12-volt electrical system.
The type 57 is a single-filament bulb rated at 1W and uses a BA9s base, which is a miniature bayonet-style cap with a 9mm collar.
The type 67 is a single-filament bulb rated at 8W and uses a BA15s bayonet base, a larger single-contact bayonet fitting with a 15mm collar.
The BA9s base of the type 57 and the BA15s base of the type 67 are physically incompatible with each other, meaning the two bulb types are not interchangeable despite both being bayonet-style fittings.
The type 67 is described as a lower wattage variant of the 1156 bulb, which means it shares the same BA15s base as the 1156 but draws significantly less power, making direct substitution with a 1156 inadvisable for a clock light application.
The wattage difference between the two bulbs is substantial, with the type 67 at 8W drawing eight times more power than the type 57 at 1W, reflecting their distinct roles and socket designs across the two model years.