Oldsmobile Cutlass Calais Map Light Bulb Size

The Oldsmobile Cutlass Calais map light requires bulb sizes 561, 562, 906, and 1004 depending on the specific version of the vehicle. Available information covers a range from 1978 through 1991 for the specified lighting components.

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
1991	561
1990	562
1989	906
1988	562
1978-1984	1004

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	562
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004

Other Locations

Additional Notes

The 1004 bulb is the most frequently specified map light bulb across the Oldsmobile Cutlass Calais model years covered, appearing in all listed years from 1978-1984.
The 1004 is a dual-filament bulb rated at 12V and 21/5W, meaning it operates two separate filaments at different wattages within a single unit.
It uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect insertion by offsetting the two pins at different heights.
The 1004 is noted as a variant of the 1157, a widely available automotive bulb, which indicates a degree of cross-compatibility within that bulb family.
The 1990 and 1988 Cutlass Calais share the 562 bulb specification for the map light, while the 1991 model uses the 561 instead.
The 561 and 562 are both ANSI-standard festoon bulbs rated at 12V and 12W with a 44mm length and end-cap contacts, making them physically similar types.
Despite their near-identical specifications, the 561 and 562 are listed as distinct ANSI bulb numbers, and substituting one for the other without confirming fitment is not advised.
The 1989 Oldsmobile Cutlass Calais map light uses the 906, a T10 miniature wedge bulb rated at 12V and 8W, which is a lower-wattage type compared to the festoon bulbs used in adjacent model years.
The T10 wedge base of the 906 is a push-in design with no separate base pins, making it physically incompatible with the festoon and bayonet sockets used by the other bulb types in these specifications.
All four bulb types listed across these specifications conform to ANSI standards applicable in both the United States and Canada.