Nissan GT-R Turn Signal Bulb Size

Additional Notes

• The rear turn signal position on the Nissan GT-R uses the 7440NA across all model years covered in the specifications, from 2009 through 2024. This bulb is a single-filament T20 wedge type rated at 12V and 21W with natural amber glass, conforming to the ANSI standard for the US and Canada market.
• The front turn signal position draws from three different bulb types across the same model year range, reflecting hardware variation between production years rather than a single standardized fitment.
• The 7443NA and 7444NA are both dual-filament T20 wedge bulbs rated at 12V with a 21W high-filament and 5W low-filament output. Both carry natural amber glass and meet the same ANSI standard, making their electrical and physical profiles nearly identical within the T20 wedge format.
• Despite their near-identical specifications, the 7443NA and 7444NA are not confirmed as interchangeable in these specifications. The GT-R front turn signal position alternates between the two across different model years, and substituting one for the other without verifying socket compatibility could result in an improper fit.
• The 2357NA, specified for the Nissan GT-R front turn signal in 2023-2024, differs fundamentally from the T20 wedge types used in earlier years. It uses a BAY15d bayonet base rather than a wedge base, operates at a higher wattage of 26.9W on its primary filament, and is physically incompatible with sockets designed for T20 wedge bulbs.
• The shift to the 2357NA in 2023-2024 means the front turn signal socket type changed from the wedge format used in prior model years. A bulb from a pre-2023 front turn signal position cannot be installed in a 2023-2024 front socket, and vice versa.
• All four bulb types in these specifications use natural amber glass to produce their amber output. This construction method differs from clear-glass bulbs paired with amber-tinted housings or amber-coated lenses, and it is a factor relevant to legal compliance in markets that regulate turn signal color at the bulb level.
• The 7440NA used at the rear is a single-filament bulb, while the front positions across all years use dual-filament types. This distinction means rear and front turn signal bulbs on the GT-R are not interchangeable regardless of model year, as the filament count and base configurations do not match.