The Mercedes-Benz SLK55 AMG front turn signal bulb size specifications include 3357NA and 3457NA, while rear turn signal bulb size options consist of 12496 and 1156NA. The replacement chart covers 2005 through 2016 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 3457NA is the most frequently specified front turn signal bulb across the Mercedes-Benz SLK55 AMG range, appearing in both the 2005 and 2012-2015 model years, as well as 2007, 2009, and 2010. It is a dual-filament T25 wedge bulb rated at 12V with a 27W main filament and a 7W secondary filament, conforming to ANSI standards for the US and Canadian markets.
The 3357NA is a single-filament T25 wedge bulb rated at 12V and 27W. It shares the same T25 wedge form factor and natural amber glass as the 3457NA but carries only one filament rather than two, making the two types functionally distinct despite their physical similarities.
The front turn signal position on the Mercedes-Benz SLK55 AMG uses the 3357NA in the 2006, 2008, and 2016 model years, and the 3457NA in all remaining specified years. The alternation between these two types across different model years indicates that the two bulbs are not interchangeable for this application.
All front turn signal entries for the 2012-2016 model years carry the condition "With Halogen Capsule Headlamps," indicating that the specified bulb size applies specifically to vehicles equipped with that headlamp configuration.
The natural amber glass construction of both the 3357NA and 3457NA produces an amber output directly from the bulb envelope. This approach meets amber turn signal regulations without relying on a colored lens to achieve the required hue.
The rear turn signal position transitions from the 1156NA in 2005-2006 to the 12496 in 2007-2010. These two bulb types differ in base design, with the 1156NA using a BA15s bayonet base and the 12496 classified as a specialty halogen application, making them non-interchangeable.
The 1156NA is rated at 12V and 21W and uses a BA15s bayonet base with a single filament. Its natural amber glass serves the same direct-amber function as the NA-suffix bulbs used in the front position.
The 12496 is identified by a Philips/Osram part number rather than an ANSI designation, which places it outside the standardized ANSI numbering system used for the other bulbs in these specifications. Its voltage is listed at 12V, though no wattage figure is provided in the available description.
The "NA" suffix present on the 3357NA, 3457NA, and 1156NA designations denotes natural amber glass, distinguishing these variants from their clear-glass counterparts within the same ANSI bulb families.
The rear turn signal specifications cover only the 2005-2010 model years, while the front turn signal specifications extend through 2016, reflecting differing ranges of data across the two positions for the SLK55 AMG.