Subaru Crosstrek Turn Signal Bulb Size

Additional Notes

• The 7444NA and 7440NA bulbs share the same T20 wedge form factor and natural amber glass construction, but differ in filament count. The 7444NA is a dual-filament bulb rated at 21W/5W, while the 7440NA is a single-filament bulb rated at 21W. Both operate at 12V and conform to ANSI standards applicable in the US and Canada.
• Natural amber glass, as used in the 7444NA and 7440NA, produces an amber-colored output without relying on an amber-tinted lens or housing. This is a factory-specified characteristic of these bulbs rather than an aftermarket modification.
• The 7440 bulb shares the same T20 wedge base, 12V operating voltage, and 21W rating as the 7440NA, but its specification does not include the natural amber glass designation, indicating a clear glass envelope.
• The 12961 is a Philips part number designation rather than an ANSI standard code. It uses a T10 wedge form with a W2.1x9.5d base, operates at 12V, and is rated at 5W, placing it in a significantly lower power class than the T20 bulbs listed elsewhere in the specifications.
• For the Subaru Crosstrek front turn signal, the 7444NA applies uniformly across the 2018-2024 model years, while the 2017 model year uses the 7440NA. The difference between these two bulbs is the filament count, meaning the 7440NA cannot serve as a direct replacement for the 7444NA without a loss of the secondary filament function.
• The rear turn signal position shows variation across model years. The 2021 Subaru Crosstrek rear turn signal uses the 7440, which lacks the natural amber glass of the 7440NA specified for 2017-2020 and 2023. Substituting between these two types may affect the color output at the rear turn signal position.
• The rear turn signal for the 2022 and 2024 model years uses the 12961, a T10 bulb, which is physically and electrically distinct from the T20 bulbs used in other model years. The T10 and T20 wedge bases are not interchangeable, and the wattage difference (5W versus 21W) is substantial.
• Given the variation in rear turn signal bulb types across model years, the year of the specific vehicle is a necessary reference point before selecting a replacement rear turn signal bulb for the Crosstrek.