Mercedes-Benz SLK55 AMG Dome Light Bulb Size

The Mercedes-Benz SLK55 AMG dome light uses 12961 and H6W bulb sizes for the interior lighting system. Data for the specified components covers the period from 2005 through 2010.

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
2007-2010	12961 (Front)
2005-2006	H6W

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W

Other Locations

Additional Notes

The Mercedes-Benz SLK55 AMG uses two distinct dome light bulb types across its model years, with the H6W fitted in 2005-2006 models and the 12961 fitted in 2007-2010 models.
The 12961 is a Philips part number designation for a T10 miniature wedge bulb operating at 12V and 5W, with a W2.1x9.5d base.
The H6W follows the ECE standard used across Europe and worldwide, operating at 12V and 6W, with a BAX9s base and a single-filament signalling construction.
The W2.1x9.5d base of the 12961 and the BAX9s base of the H6W are physically incompatible, meaning the two bulb types are not interchangeable despite their similar voltage ratings.
The H6W carries a 1W higher wattage rating than the 12961, a difference that reflects the distinct base and socket designs each bulb requires.
The BAX9s base used by the H6W is an offset pin base, a design that prevents incorrect insertion by ensuring the bulb seats in only one orientation.
The T10 wedge form factor of the 12961 is among the most widely used miniature bulb formats in automotive interior lighting, relying on the flexibility of the socket contacts rather than a keyed pin to retain the bulb.
The front dome light position is specified for the 12961 across the 2007-2010 SLK55 AMG, indicating that bulb is designated for that specific location within the cabin.