Chevrolet Del Ray Trunk Bulb Size

The Chevrolet Del Ray trunk light requires a 1003 bulb size or a 94 bulb size depending on the specific application. Data for the lighting components 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 Type	Shop
1958	1003	Check Price
1957	94	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	94	Check Price

Other Locations

Additional Notes

The 1003 bulb is a single-filament type operating at 12 volts and 21 watts, fitted with a BA15s bayonet base. The BA15s designation indicates a single-contact base with a 15mm collar, which is not interchangeable with dual-contact bayonet bases.
The 94 bulb is a dual-filament type rated at 12 volts with two wattage outputs: 21W and 5W. It uses a BAY15d bayonet base, which features offset pins to prevent incorrect installation.
The 94 bulb is a variant of the 1157. Despite the shared base type and similar electrical ratings, the 94 and 1157 are not the same part number and may differ in filament positioning or light output characteristics.
The 1958 Chevrolet Del Ray uses the 1003 bulb for the trunk, while the 1957 model uses the 94. These two bulbs have different base types, BA15s and BAY15d respectively, making them physically non-interchangeable with each other.
Both the 1003 and 94 are ANSI-standardized bulbs recognized in the United States and Canada, meaning they conform to defined dimensional and electrical tolerances within those markets.