The Mercedes-Benz SLK55 AMG parking light utilizes 12961 and 3457NA bulb sizes for the front illumination system. Available data for the specified lighting components covers the period from 2005 through 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz SLK55 AMG uses the 12961 bulb for the front parking light across the 2005-2016 model years, with no variation in this position throughout that span.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The T10 form factor is a small single-filament wedge type, commonly used in low-intensity lighting positions such as parking lights and side markers.
A second bulb type, the 3457NA, is specified for the 2005-2006 model years in a separate position within the front parking light assembly.
The 3457NA follows the ANSI standard used in the United States and Canada, and it is a dual-filament T25 wedge bulb with natural amber glass, rated at 12V and 27W/7W.
The dual-filament design of the 3457NA means it serves two distinct lighting functions from a single bulb, with the higher wattage filament and the lower wattage filament operating independently.
The natural amber glass of the 3457NA produces an amber output without the use of a colored lens or coating over a clear bulb, which is a characteristic of the NA designation in ANSI bulb nomenclature.
The 12961 and 3457NA are not interchangeable, as they differ in base type, filament count, wattage, and physical size, with the T25 being a notably larger wedge than the T10.