Volkswagen Quantum Map Light Bulb Size

The Volkswagen Quantum map light requires a bulb size of 12961 for the interior lighting system. Data for the specific bulb requirements covers the range from 1987 to 1988.

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
1987-1988	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The 1987-1988 Volkswagen Quantum uses the 12961 bulb for the map light position.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, operating at 12 volts and 5 watts.
The T10 designation refers to the bulb's tubular shape, with the number indicating a width of 10 thirty-seconds of an inch.
The W2.1x9.5d base type is a wedge-style base, meaning the bulb is held in its socket by the tension of the glass envelope itself rather than by a separate metal base with pins.
The W2.1x9.5d base specification defines the wedge width as 2.1 mm and the insertion depth as 9.5 mm, which determines physical fitment into the socket.
Any replacement bulb intended for this application must match both the W2.1x9.5d base and the 12V, 5W electrical rating to ensure proper fitment and circuit compatibility.
T10 wedge bulbs are a widely used form factor, and aftermarket or OEM-equivalent substitutes must share the W2.1x9.5d base geometry to be interchangeable with the 12961 in this application.