The Mercedes-Benz SLK55 AMG uses a 12961 bulb size for the front side marker and a 67 bulb size for the rear side marker. The replacement chart covers 2005 through 2010 production years with corresponding bulb size specifications.
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 two distinct bulb types across its front and rear side marker positions, the 12961 and the 67, each with different base types and wattage ratings.
The 12961 is a Philips part number designation for a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base and rated at 12V and 5W.
The T10 wedge base of the 12961 is a push-in connector type, meaning it does not twist or lock into the socket and relies on friction retention for contact.
The front side marker position on the SLK55 AMG uses the 12961 bulb across the 2005-2010 model years.
The 67 is an ANSI-standardized bulb type recognized in both the United States and Canada, fitted with a BA15s single-contact bayonet base and rated at 12V and 8W.
The BA15s bayonet base of the 67 uses a twist-and-lock retention mechanism, which is mechanically distinct from the wedge base of the 12961, making the two bulbs non-interchangeable.
The 67 is a lower-wattage variant of the 1156 bulb, sharing the same BA15s base but drawing less power, which means a 1156 is not a direct drop-in replacement for the 67 without accounting for the wattage difference.
The rear side marker position on the SLK55 AMG uses the 67 bulb for the 2005-2006 model years.
The front side marker bulb at 5W draws notably less power than the rear side marker bulb at 8W, reflecting a difference in the lighting output requirements between the two positions.
The front and rear side marker sockets on the SLK55 AMG are physically incompatible with each other due to the differing base types, the W2.1x9.5d wedge for the front and the BA15s bayonet for the rear.