Ski-Doo Summit 550 Fan Tail Light Bulb Size

The Ski-Doo Summit 550 Fan tail light utilizes 1157 and P21/5W bulb sizes for the lighting components. Data for the specified lighting equipment covers the period from 2003 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
2003-2009	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The 1157 is the tail light bulb size specified for the Ski-Doo Summit 550 Fan across all listed model years, spanning 2003-2009.
The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single unit, typically combining a brighter stop light filament with a dimmer running light filament.
It operates on a 12-volt electrical system and carries a dual wattage rating of 21W and 5W, corresponding to its two filaments respectively.
The 1157 uses a BAY15d bayonet base, which features two offset pins that lock the bulb into its socket at a fixed rotational position, ensuring correct filament alignment.
The 1157 designation follows the ANSI standard recognized in both the United States and Canada, placing it within a standardized North American bulb classification system.
Because the 1157 is a dual-filament type, it is not directly interchangeable with single-filament bulbs such as the 1156, which shares the same bayonet base style but carries only one filament and lacks the second pin offset required for proper seating in a dual-filament socket.