Edsel Corsair Back Up Light Bulb Size

The Edsel Corsair back up light requires bulb size 1141 or P21W depending on the specific application. Data for the bulb sizes covers the range from 1958 to 1959.

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
1959	P21W
1958	1141

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1141

Other Locations

Additional Notes

The 1958 Edsel Corsair uses a 1141 bulb for the back up light, while the 1959 model uses a P21W bulb.
Both the 1141 and P21W are single-filament bulbs rated at 12V and 21W, sharing identical electrical characteristics.
Despite their equivalent power ratings and shared BA15s bayonet base, the 1141 follows the ANSI standard used in the US and Canada, whereas the P21W follows the ECE standard used in Europe and worldwide.
The BA15s bayonet base is a single-contact fitting, which is consistent with the single-filament design of both bulb types.
Because the 1141 and P21W share the same base type and electrical ratings, physical fitment between the two is mechanically possible, though they originate from different standardization systems.