The Mercedes-Benz CLK320 parking light utilizes bulb sizes 12961 and H6W for illumination. Data for the specified components covers the period from 1998 through 2005.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6W is an ECE-standard single-filament signalling bulb rated at 12V and 6W, fitted with a BAX9s base. It is the bulb type used across the majority of years covered in the Mercedes-Benz CLK320 front parking light specifications.
The BAX9s base is an offset pin cap, meaning it is not interchangeable with standard bayonet or wedge-type bases despite sharing a similar voltage and wattage range with other small signalling bulbs.
The 12961 is a Philips part number designating a miniature wedge bulb of the T10 form factor, rated at 12V and 5W, with a W2.1x9.5d base. It draws 1W less than the H6W.
The W2.1x9.5d base on the 12961 is a wedge-type fitting, which is physically and electrically distinct from the BAX9s base on the H6W. The two bulb types are not interchangeable.
The Mercedes-Benz CLK320 front parking light used the H6W from 1998-2003 in one listed sub-part grouping, establishing it as the longer-running fitment across the model's production span in that position.
A second sub-part grouping shows the CLK320 front parking light transitioning to the 12961 for the 2003-2005 model years, while retaining the H6W for 1998-2002.
The year 2003 is associated with both the H6W and the 12961 across the two sub-part groupings, indicating that two separate front parking light positions existed on the vehicle, each specifying a different bulb type for that year.