Nissan 260Z Back Up Light Bulb Size

The Nissan 260Z back up light requires a bulb size of P21W for the lighting assembly located at the rear of the vehicle. Data for the specified component covers the range from 1974 to 1975.

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
1974-1975	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 bulb type specified for the Nissan 260Z backup light across both available model years, 1974-1975.
The P21W is an ECE-standard single-filament signalling bulb rated at 12 volts and 21 watts, fitted with a BA15s bayonet base.
The BA15s bayonet base uses a single-pin contact arrangement, which is a distinguishing fitment detail from the dual-pin BA15d base used on double-filament bulbs.
The ECE designation indicates the P21W conforms to European and international regulatory standards for signalling bulbs.
At 21 watts, the P21W operates at a higher wattage than many smaller signalling bulbs, which is typical for backup light applications requiring adequate rear illumination.
The single-filament construction of the P21W means it serves one lighting function only, as opposed to dual-filament bulbs that combine two functions within a single unit.
The BA15s base is not interchangeable with visually similar bayonet bases that carry different pin configurations, as substituting an incompatible base type would prevent correct seating in the socket.