Plymouth Fury I Back Up Light Bulb Size

The Plymouth Fury I back up light uses bulb sizes 1156 and P21W according to the provided specifications for the lighting components. Data for the bulbs covers the range from 1968 to 1974.

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
1968-1974	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

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Additional Notes

The 1156 is the sole bulb type specified for the back up light across all listed model years of the Plymouth Fury I, spanning 1968-1974.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than switching between two brightness levels as a dual-filament bulb would.
The 1156 operates at 12 volts and 21 watts, which places it within the standard low-voltage automotive electrical range typical of vehicles from this era.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place.
The 1156 conforms to ANSI standards, indicating it meets a defined specification recognized across the United States and Canada.
The BA15s designation refers to a bayonet base with a 15mm collar and a single contact pin, which is not interchangeable with the BA15d base used on dual-filament bulbs of otherwise similar physical form.