Nissan 350Z Back Up Light Bulb Size

The Nissan 350Z back up light requires a 7440 bulb size for the specific lighting component located at the rear of the vehicle. Data for the bulb specifications covers the range from 2003 to 2005.

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
2003-2005	7440

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

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Additional Notes

The 7440 is the sole backup light bulb size listed for the Nissan 350Z across the 2003-2005 model years.
The 7440 bulb follows the ANSI standard, which is the recognized specification body for automotive lighting in the United States and Canada.
It belongs to the T20 wedge family, a form factor defined by a wedge-shaped base that seats directly into a socket without a separate metal cap or pins.
The 7440 operates on a 12-volt circuit, consistent with the standard electrical architecture of passenger vehicles in this era.
Its 21-watt rating places it in the mid-range of incandescent automotive bulbs, a wattage typical for reverse light applications where a clear, bright output is required.
The single-filament construction of the 7440 means it serves one lighting function only, distinguishing it from dual-filament T20 variants such as the 7443, which are not interchangeable with this application.