Cadillac Series 60 Fleetwood Map Light Bulb Size

The Cadillac Series 60 Fleetwood map light requires bulb size 212-2 or 90 depending on the specific application. Data for the map light covers the range from 1953 to 1964.

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
1963-1964	212-2
1962	90
1953-1960	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The bulb type 90 is the most frequently specified map light bulb across the Cadillac Series 60 Fleetwood, covering model years 1953-1960 and 1962.
The 90 bulb is a single-filament type with a BA15s bayonet base, rated at 12 volts and 13 watts, and conforms to ANSI standards applicable in the US and Canada.
The BA15s bayonet base designation indicates a single-contact bayonet fitting with a 15mm base width, a common format in mid-century automotive interior lighting.
The 212-2 bulb is specified for the 1963-1964 model years, representing a change in map light bulb type during that period.
The 212-2 is a festoon-style bulb with an SV8.5 base and a 41mm length, rated at 12 volts and 12 watts, also conforming to ANSI standards for the US and Canada.
Festoon bulbs are cylindrical in form and mount by contact pressure at each end rather than by a base socket, which is a fundamentally different fitment method from the bayonet base used by the 90 bulb.
The two bulb types, 90 and 212-2, are not interchangeable due to their differing base configurations, physical forms, and mounting methods.
The wattage difference between the 90 (13W) and the 212-2 (12W) is minor, though the socket and housing requirements for each type are distinct.