The Mercedes-Benz SLK32 AMG front side marker bulb uses 12961 or 12821 size, while the rear side marker bulb uses 67 or 12821 size. The replacement chart covers 2002 to 2004 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 SLK32 AMG uses three distinct bulb types across its front and rear side marker positions: the 12961, the 12821, and the 67.
Both the 12961 and 12821 are Philips part numbers designating miniature wedge bulbs of the T10 form factor, each rated at 12V and 5W with a W2.1x9.5d base.
Despite carrying different Philips part numbers, the 12961 and 12821 share identical electrical ratings, base type, and bulb form factor.
The 12821 is specified for the front side marker on the 2002-2003 SLK32 AMG, while the 2004 model year front side marker calls for the 12961 instead.
The rear side marker on the 2002-2003 SLK32 AMG also uses the 12821, making it the same bulb type as the front side marker for those years.
The 2004 rear side marker position shifts to the 67 bulb, which differs substantially from the wedge-type bulbs used in all other positions on this vehicle.
The 67 is an ANSI-standard bulb recognized in the US and Canada, rated at 12V and 8W, and uses a BA15s single-contact bayonet base rather than a wedge base.
The BA15s base of the 67 bulb is physically incompatible with the W2.1x9.5d wedge sockets used by the 12961 and 12821, meaning these bulb types are not interchangeable with one another.
The 67 bulb is described as a lower wattage variant of the 1156, sharing the same BA15s bayonet base but drawing 8W compared to the 1156's higher wattage rating.
The wattage difference between the wedge-type bulbs at 5W and the 67 at 8W reflects a meaningful difference in power draw, which is relevant when assessing socket and circuit compatibility.