Oldsmobile Jetstar 88 Dome Light Bulb Size

The Oldsmobile Jetstar 88 dome light requires bulb size 1004 or 211-2 depending on the specific application. Data for the bulb sizes covers the range from 1964 to 1966.

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
1966	1004
1965	211-2
1964	1004

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). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The 1004 bulb follows the ANSI standard used in the United States and Canada. It is a dual-filament bulb rated at 12V and 21/5W, fitted with a BAY15d bayonet base, and is classified as a variant of the more widely known 1157 bulb.
The BAY15d base on the 1004 features two offset pins at different heights, which physically prevents incorrect insertion and ensures the dual filaments are aligned to their intended circuits.
The 211-2 bulb also follows the ANSI standard for the US and Canadian markets. It is a festoon-type bulb measuring 41mm in length, mounted on an SV8.5 base, and rated at 12V and 12W.
Festoon bulbs such as the 211-2 make contact at both ends of the tube rather than through a base pin or bayonet fitting, which is a fundamentally different mounting method from the BAY15d bayonet system used by the 1004.
The Oldsmobile Jetstar 88 used the 1004 bulb for the dome light in 1964 and 1966, while the 1965 model year used the 211-2 instead.
Because the 1004 and 211-2 use entirely different base types, one cannot be substituted for the other without a socket adapter or housing modification.
The 1004 carries a dual-filament design rated at 21W and 5W respectively, which is a characteristic more commonly associated with stop/tail lighting applications, though it is specified here for dome light use on the 1964 and 1966 Jetstar 88.
At 12W, the 211-2 used in the 1965 Jetstar 88 draws more power than the lower 5W filament of the 1004, though less than the 1004's higher 21W filament.