Fiat 124 Spider front and rear turn signal bulbs use 7440NA size bulbs for replacement. The chart covers 2017 to 2020 production years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Fiat 124 Spider uses the 7440NA bulb for both its front and rear turn signals across the 2017-2020 model years.
The 7440NA is a single-filament wedge bulb built to the T20 form factor, operating at 12 volts and rated at 21 watts.
The "NA" suffix in the 7440NA designation indicates natural amber glass, meaning the bulb produces an amber output without relying on a clear lens or external amber housing to achieve the required turn signal color.
The 7440NA conforms to ANSI standards, making it a regulated specification recognized across the United States and Canada.
Because the 7440NA uses natural amber glass, substituting it with a clear 7440 bulb in the Fiat 124 Spider could result in incorrect turn signal color output if the housing itself is also clear rather than amber-tinted.
The single-filament construction of the 7440NA means the bulb serves one dedicated function per socket, as opposed to dual-filament bulbs that can serve two functions such as turn signal and brake light simultaneously.
The uniform use of the 7440NA across both front and rear positions on the Fiat 124 Spider means both locations share the same bulb specification, though each socket remains a physically separate fitment.