Chevrolet Sedan Delivery Dome Light Bulb Size

The Chevrolet Sedan Delivery dome light requires bulb size 1004 or 94 depending on the specific application for the interior lighting fixture. Data for the bulb sizes covers the range from 1956 through 1960.

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
1958-1960	1004
1956-1957	94

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	94

Other Locations

Additional Notes

The Chevrolet Sedan Delivery used two different dome light bulb sizes across the 1956-1960 model years: the 94 for 1956-1957 and the 1004 for 1958-1960.
Both the 94 and 1004 are ANSI-standardized bulb types recognized in the United States and Canada.
Each bulb is a dual-filament type, meaning it contains two separate filaments within a single envelope, allowing it to operate at two distinct wattage levels.
Both bulbs share the BAY15d bayonet base, a two-pin base with pins at different heights to ensure correct orientation during installation.
The 94 and 1004 are each classified as variants of the 1157, a widely used automotive bulb type with the same BAY15d base and dual-filament configuration.
Both bulbs operate at 12 volts with a 21/5 watt output, where 21 watts corresponds to the high-filament draw and 5 watts to the low-filament draw.
Because the 94 and 1004 share identical electrical ratings, base type, and filament configuration, they are functionally interchangeable in applications where fitment allows.