Arctic Cat 350 Back Up Light Bulb Size

Arctic Cat 350 back up light bulb size 12821 specifications are documented in a replacement chart. The chart covers vehicle production years 2011 to 2012.

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
2011-2012	12821

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12821

Other Locations

Additional Notes

The 12821 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base. It operates at 12 volts and draws 5 watts.
The T10 designation refers to the bulb's tubular shape, with the number indicating its width in eighths of an inch. The W2.1x9.5d base is a wedge-type connector, meaning the bulb is held in place by tension rather than a locking mechanism.
The Arctic Cat 350 uses the 12821 bulb for the back up light position across the 2011-2012 model years.
The W2.1x9.5d base type is not interchangeable with bayonet or festoon base bulbs, as the wedge design requires a socket specifically built to accept that base configuration.