The INFINITI FX35 front turn signal requires a 7440NA bulb size, while rear turn signal applications use either 7440 or 12961 bulb sizes depending on configuration. The replacement chart covers vehicle production spanning 2003 to 2012 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The INFINITI FX35 front turn signal uses the 7440NA bulb across all model years from 2003-2012.
The 7440NA is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, and features natural amber glass that produces a yellow-orange light output without relying on a colored lens or housing.
The "NA" suffix in 7440NA distinguishes it from the standard 7440 by its natural amber glass coating, meaning the two bulbs are not identical despite sharing the same base type, wattage, and voltage rating.
The rear turn signal on the INFINITI FX35 (2009-2012) uses the 7440, a clear-glass T20 single-filament wedge bulb rated at 12V and 21W, which shares the same electrical specifications as the 7440NA used at the front.
The rear turn signal on the FX35 (2003-2008) uses the 12961, a miniature T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, which is substantially lower in wattage than the 7440 used in later model years.
The 12961 is a Philips part number rather than an ANSI-standardized designation, which is relevant when sourcing equivalent replacement bulbs from other manufacturers.
The rear turn signal changed from the 12961 to the 7440 between the 2008 and 2009 model years, and these two bulbs are not interchangeable due to differences in base type, physical size, and wattage.
Both the 7440NA and the 7440 conform to ANSI standards applicable in the United States and Canada, and they share the same T20 wedge base, making them physically compatible with the same socket.