Oldsmobile Delmont 88 Dome Light Bulb Size

The Oldsmobile Delmont 88 dome light requires bulb size 211-2 or 1004 depending on the specific application for the interior lighting system. Data for the lighting components covers the range from 1967 to 1968.

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
1968	211-2
1967	1004

Bulb Specifications

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

Other Locations

Additional Notes

The 1968 Oldsmobile Delmont 88 uses a 211-2 bulb for the dome light. This is a festoon-style bulb, meaning it mounts horizontally between two end caps rather than inserting into a socket from below.
The 211-2 measures 41mm in length and uses an SV8.5 base. It operates at 12 volts and draws 12 watts, placing it in the lower wattage range typical of interior courtesy lighting.
The 1967 Delmont 88 uses a 1004 bulb for the dome light. This type uses a BAY15d bayonet base, which features two pins offset at different heights to ensure correct orientation during installation.
The 1004 is a dual-filament bulb rated at 12 volts with a 21/5W output, meaning it carries one filament at 21 watts and a second at 5 watts. This is a notable characteristic for a dome light application, as single-filament bulbs are more common in that position.
The 1004 is described as a variant of the 1157. The 1157 is a widely used automotive bulb, and the 1004 shares its BAY15d base and dual-filament design while differing in wattage output.
Both the 211-2 and 1004 conform to ANSI standards recognized in the United States and Canada, indicating standardized dimensional and electrical tolerances across manufacturers.
The two model years use physically incompatible bulb types. The 211-2 is a festoon bulb with end-cap contacts, while the 1004 uses a bayonet base. The socket designs are not interchangeable between the 1967 and 1968 vehicles.