The Mitsubishi 3000GT front turn signal uses a 1034NA, 3496, or P21W bulb size, while the rear turn signal requires a 2057 or P21W bulb size. The replacement chart covers vehicle production years spanning 1991 to 1999.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mitsubishi 3000GT front turn signal uses three distinct bulb types across its production years: the P21W for 1991-1993, the 3496 for 1994-1998, and the 1034NA for 1999.
The rear turn signal of the 3000GT follows a two-phase pattern, with the P21W fitted to 1991-1993 models and the 2057 fitted to 1994-1999 models.
The 3496 and 1034NA are both ANSI-standard dual-filament bulbs sharing the BAY15d bayonet base and are variants of the 1157, meaning they share the same base configuration as that widely used reference bulb.
The 1034NA, used in the 1999 front turn signal position, is distinguished from the 3496 by its natural amber glass, which produces an amber signal output without relying on an amber lens.
The 2057, used in the rear turn signal position for 1994-1999, is rated at 26.9W on its high-intensity filament and 8W on its low-intensity filament, making it a brighter variant of the 1157 while retaining the same BAY15d bayonet base.
The P21W follows the ECE standard rather than the ANSI standard and uses a BA15s single-contact bayonet base, which is not interchangeable with the BAY15d double-contact base used by the 3496, 1034NA, and 2057.
Because the BA15s and BAY15d bases are physically distinct, P21W bulbs fitted to 1991-1993 models cannot be substituted with ANSI-type bulbs from later model years without a socket incompatibility.
The P21W is a single-filament bulb rated at 21W, whereas the dual-filament ANSI bulbs used in later years operate both a primary and a secondary filament, serving signalling and running light functions from a single housing.
The 3496 shares its BAY15d base and dual-filament design with the 1034NA and 2057, but its wattage rating is not specified in the provided data, unlike the other three bulb types which carry explicit wattage values.
The front and rear turn signal positions on the 1991-1993 Mitsubishi 3000GT use the same P21W bulb, while from 1994 onward the front and rear positions diverge, requiring different bulb types.