The Mercedes-Benz CL550 parking light uses bulb size 12961 for illumination purposes. Available data covers the range from 2007 through 2014 for the specified vehicle lighting component.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz CL550 uses the 12961 bulb for the front parking light across all listed model years, spanning 2007-2014.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, operating at 12 volts and rated at 5 watts.
The T10 designation refers to a tubular bulb roughly 10mm in width, a common sizing standard used across many low-intensity automotive lighting positions.
The W2.1x9.5d base type is a wedge-style connector, meaning the bulb is held in place by friction from its plastic base rather than by a bayonet or screw mechanism.
At 5 watts, the 12961 is a low-output bulb suited to parking and position lighting rather than primary illumination functions.
The W2.1x9.5d base specification is a precise fitment standard, and substituting a bulb with a different base type would result in an incompatible fit regardless of voltage or wattage similarity.
The consistent use of the 12961 across the full 2007-2014 model range of the CL550 indicates no front parking light bulb specification change occurred during that production period.