Buick Wildcat Dome Light Bulb Size

The Buick Wildcat dome light requires bulb sizes 89, 90, 1004, and 211-2 depending on the specific production period for the vehicle. Available data covers the range from 1962 through 1970.

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
1970	89
1969	211-2
1963-1968	1004
1962	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89
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
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The 1004 bulb is the most frequently specified dome light bulb across the Buick Wildcat lineup, covering the 1963-1968 model years.
The 1004 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21/5W, and is a variant of the widely known 1157 bulb type.
The BAY15d base on the 1004 uses offset pins to prevent incorrect installation, a physical characteristic that distinguishes it from single-filament bayonet types.
The 1970 Buick Wildcat uses the 89 bulb, a single-filament type with a BA15s bayonet base rated at 12V and 13W, described as a lower wattage variant of the 1156.
The 90 bulb, specified for the 1962 Wildcat, shares the same BA15s bayonet base and 12V, 13W rating as the 89, though the two carry distinct ANSI designations and are not listed as interchangeable.
The 1969 Wildcat uses the 211-2, a festoon-style bulb with an SV8.5 base measuring 41mm in length, rated at 12V and 12W. Its mounting style differs fundamentally from the bayonet-base bulbs used in surrounding model years.
All four bulb types in these specifications, the 89, 90, 211-2, and 1004, conform to ANSI standards applicable in both the United States and Canada.
The shift from the dual-filament 1004 in 1968 to the festoon-style 211-2 in 1969 reflects a base-type change, meaning the two bulbs are not physically interchangeable despite serving the same dome light function.
The BA15s base, found on both the 89 and 90 bulbs, is a single-contact bayonet fitting. Because the 1004 uses the BAY15d base instead, bayonet-base bulbs across these model years are not cross-compatible.