Pontiac Fiero Map Light Bulb Size

The Pontiac Fiero map light requires bulb size 906 or 561 depending on the specific configuration of the interior lighting system. Data for the bulb sizes covers the range from 1984 to 1987.

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
1987	906
1984-1985	561

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561

Other Locations

Additional Notes

The 561 bulb is a festoon-type unit with end-cap contacts and a 44mm length, operating at 12 volts and 12 watts. This contact style requires the bulb to be held under spring tension between two metal clips rather than inserted into a socket.
The 906 bulb is a T10 miniature wedge type, operating at 12 volts and 8 watts. The wedge base is held in place by friction within a plastic socket, with no separate metal contacts required.
Both the 561 and 906 are ANSI-rated standards recognized in the United States and Canada, meaning their electrical and physical tolerances conform to a defined North American specification.
The Pontiac Fiero used the 561 festoon bulb for the map light in 1984-1985, while the 1987 model year used the 906 wedge bulb instead. These two bulb types are not interchangeable due to their fundamentally different base designs and mounting methods.
The wattage difference between the two bulb types is notable. The 561 draws 12 watts while the 906 draws 8 watts, meaning the earlier Fiero map light operated at a higher power draw than the later configuration.