Chevrolet Biscayne Dome Light Bulb Size

The Chevrolet Biscayne dome light utilizes 211-2 and 1004 bulb sizes for interior illumination across various production periods. Available data covers a span of time from 1958 through 1972.

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
1961-1972	211-2	Check Price
1958-1960	1004	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004	Check Price

Other Locations

Additional Notes

The Chevrolet Biscayne dome light uses two distinct bulb types across its 1958-1972 model range: the 211-2 festoon bulb and the 1004 bayonet bulb.
The 211-2 bulb is a festoon type, meaning it is a cylindrical lamp held in place by spring clips at each end rather than a twist or plug-in base. It measures 41mm in length and uses an SV8.5 base, operating at 12V and 12W.
The 1004 bulb uses a BAY15d bayonet base and carries a dual-filament design rated at 12V with a 21/5W output. It is a variant of the widely used 1157 bulb family.
Both the 211-2 and the 1004 conform to ANSI standards recognized in the United States and Canada.
The Chevrolet Biscayne (1961-1972) uses the 211-2 festoon bulb for the dome light across all twelve of those model years.
The 1004 bayonet bulb is specified for the 1958-1960 model years.
Because the 211-2 and the 1004 use entirely different base types, a festoon clip socket and a bayonet socket, the two bulbs are not interchangeable with each other despite both serving the dome light function.
The 1004 is a dual-filament bulb, a characteristic that is atypical for a dome light application, where single-filament operation is more common. Only one filament would be active in a dome light circuit.