Mercedes-Benz CL63 AMG Map Light Bulb Size

The Mercedes-Benz CL63 AMG map light utilizes 12961 and 6411 bulb sizes according to the provided specifications. Available information covers the production range from 2008 through 2014.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2010-2014	12961
2008-2009	6411

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Mercedes-Benz CL63 AMG uses two distinct map light bulb types across its model years, split between the 6411 festoon bulb for 2008-2009 and the 12961 wedge bulb for 2010-2014.
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 T10 wedge form factor uses a pinched glass base that wedges directly into its socket, requiring no separate locking mechanism.
The 6411 is an ANSI-standard festoon bulb recognized across the US and Canadian markets, featuring a 36mm length and an SV8.5 base, also rated at 12V and 5W.
Festoon bulbs of the SV8.5 type are held in place by spring-loaded end caps within a cylindrical housing, a mounting method fundamentally different from the wedge socket used by the T10.
Both bulb types share identical voltage and wattage ratings of 12V and 5W, meaning the electrical load on the circuit remains consistent across all listed model years.
The 12961 and 6411 are not interchangeable. Their base types, physical form factors, and socket designs are incompatible with one another despite sharing the same electrical ratings.
The W2.1x9.5d base designation on the 12961 refers to a standardized IEC base code, where the numeric values describe the contact pin spacing and insertion depth of the wedge.
The SV8.5 base designation on the 6411 indicates a festoon-type contact system where the bulb length of 36mm is a critical fitment factor, as festoon sockets are sized to specific lengths.