Mercedes-Benz ML320 Map Light Bulb Size

The Mercedes-Benz ML320 map light utilizes bulb sizes 12961 and 6411 according to the provided specifications for the interior lighting components. Available data for the specified vehicle covers the period from 1998 through 2009.

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
2008-2009	12961
2007	6411
1998-2003	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 ML320 map light specifications cover model years 1998-2009 and reference two distinct bulb sizes: 6411 and 12961.
The 6411 is an ANSI-standard festoon bulb recognized across the US and Canada, with an SV8.5 base, a 36mm length, and a 12V, 5W electrical rating.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base and sharing the same 12V, 5W rating as the 6411.
Despite identical voltage and wattage ratings, the 6411 and 12961 use fundamentally different base types, a festoon SV8.5 versus a wedge W2.1x9.5d, making them physically non-interchangeable.
The ML320 (1998-2007) uses the 6411 festoon bulb for the map light position.
The ML320 (2008-2009) uses the 12961 wedge bulb instead, indicating a change in the map light socket design for those model years.
The SV8.5 base of the 6411 is a cylindrical festoon-style connector where the bulb is held in place by spring clips at each end, a common fitment in European and domestic vehicles alike.
The W2.1x9.5d base of the 12961 is a wedge-type connector where the wire filament leads are folded into the glass base itself, eliminating a separate metal cap.
Because the 2007 ML320 uses the 6411 and the 2008 model uses the 12961, owners of vehicles near that production boundary should confirm the correct socket type before sourcing a replacement bulb.