Plymouth Sport Wagon Back Up Light Bulb Size

The Plymouth Sport Wagon back up light requires a P21W bulb size for the rear lighting assembly. Data for the specified vehicle covers the range from 1960 to 1961.

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
1960-1961	P21W

Bulb Specifications

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

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Additional Notes

The P21W is the specified back up light bulb for the Plymouth Sport Wagon across both documented model years, 1960-1961.
The P21W follows the ECE (Economic Commission for Europe) standard, a regulatory framework adopted across Europe and numerous other markets worldwide.
This bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for single-filament signalling applications.
The P21W uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant.
As a single-filament bulb, the P21W is dedicated to one function only, which in this fitment is the back up light circuit.
The BA15s base type is not interchangeable with BA15d sockets due to the differing pin configurations, and substitution between the two would result in an improper fit.