Mercedes-Benz SLC43 AMG Turn Signal Bulb Size

Mercedes-Benz SLC43 AMG front turn signal bulb uses 3357NA size. The replacement chart covers 2017 to 2019 vehicle production years with bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
2017-2019	3357NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T25), natural amber glass. 12V, 27W.	3357NA

Other Locations

Additional Notes

The 3357NA is the specified front turn signal bulb for the Mercedes-Benz SLC43 AMG across the 2017-2019 model years.
The 3357NA follows the ANSI standardization system, which is the North American classification framework used in the United States and Canada.
This bulb operates on a single-filament design, meaning it serves one lighting function only, as opposed to dual-filament bulbs that handle two functions such as turn and brake signals simultaneously.
The T25 designation refers to the wedge-style base of the bulb, a common base type in automotive applications where the glass envelope itself acts as the retention mechanism within the socket.
The natural amber glass of the 3357NA produces its amber turn signal color directly through the tinted envelope rather than relying on a colored lens housing to filter a clear bulb.
At 12 volts and 27 watts, the 3357NA operates within the standard low-voltage electrical architecture found in passenger vehicles.
The 3357NA shares its base type and wattage with several related bulbs in the 3000-series ANSI family, which can create substitution confusion; the NA suffix specifically denotes the natural amber glass variant and is not interchangeable with clear-glass counterparts of the same series without affecting signal color output.