Mercedes-Benz C43 AMG Trunk Bulb Size

The Mercedes-Benz C43 AMG trunk utilizes 12961 and 6411 bulb sizes for the internal lighting components. Available information covers the specific time range from 1998 through 2023.

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
2017-2023	12961
1998-2000	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 C43 AMG uses two distinct trunk bulb types across its model years: the 12961 for 2017-2023 and the 6411 for 1998-2000.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, operating at 12V and 5W.
The 6411 is an ANSI-standard designation recognized in the US and Canada, referring to a festoon bulb with an SV8.5 base, a 36mm length, and identical 12V, 5W electrical ratings.
Although both bulb types share the same 12V, 5W electrical rating, their physical formats are not interchangeable. The wedge base of the 12961 and the festoon format of the 6411 require different socket types.
The SV8.5 base on the 6411 is a cylindrical festoon-style fitting, where the bulb is held in place by contact at each end rather than by a wedge-inserted base.
The W2.1x9.5d base on the 12961 identifies a wedge-type fitting in which the glass envelope itself acts as the retaining element when pressed into a compatible socket.
The T10 designation on the 12961 refers to the bulb's tubular envelope size, with the number indicating a width of roughly 10/8 of an inch, a standard sizing convention in miniature automotive bulbs.