Ski-Doo Summit 1000 Highmark X Brake Bulb Size

The Ski-Doo Summit 1000 Highmark X uses a 921 bulb size for brake applications. The replacement chart covers 2005 to 2008 vehicle production years with corresponding bulb size specifications.

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	US Type	EU Type	Shop
2005-2008	921	W16W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The Ski-Doo Summit 1000 Highmark X uses the 921 bulb for the brake light across the 2005-2008 model years.
The 921 is a T15 wedge-base bulb, meaning it connects to its socket through a plastic wedge fitting rather than a bayonet or screw base.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard single-filament automotive brake light applications.
The 921 designation follows the ANSI standardization system recognized in both the United States and Canada, indicating a defined and consistent specification for the bulb's electrical and physical characteristics.
Because the 921 is a wedge-type bulb, it is not interchangeable with bayonet-base or screw-base bulb types even when voltage and wattage ratings may otherwise match.