The Mercedes-Benz CL600 front side marker bulb uses 12961 or 2357NA size, while the rear side marker bulb uses 67 or 12821 size. The replacement chart covers 1998 to 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 CL600 front side marker position uses the 12961 bulb across the 2001-2010 model years, while the 1998-1999 model years use the 2357NA bulb instead.
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 2357NA is an ANSI-standard dual-filament bulb with a BAY15d bayonet base and natural amber glass, rated at 12V with a 26.9W/8W filament split.
The natural amber glass of the 2357NA produces color through the envelope itself rather than through a colored lens, which is a notable construction difference from clear-glass bulbs.
The rear side marker position on the CL600 uses two distinct bulb types depending on model year: the 12821 for 1998-1999 and the 67 for 2001-2002.
The 12821 is a Philips part number also designating a T10 miniature wedge bulb with a W2.1x9.5d base at 12V and 5W, sharing the same base type and electrical rating as the 12961 used at the front.
Despite the 12961 and 12821 sharing identical base types and electrical ratings, they carry different Philips part numbers, and substitution between them warrants verification against fitment data before use.
The 67 is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 8W, and is classified as a lower wattage variant of the 1156 bulb family.
The BA15s base of the 67 and the BAY15d base of the 2357NA are not interchangeable; the BAY15d base features offset locating pins to prevent incorrect installation of dual-filament bulbs.
The front and rear side marker positions on the CL600 do not share a common bulb type across any model year covered in the specifications.