Polaris 800 XC SP Brake Bulb Size

The Polaris 800 XC SP brake utilizes 3157, 2458, and 921 bulb sizes for the lighting components. Data for the specific bulbs covers the range from 2001 through 2005.

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
2005	3157
2004	3157 (With Adjustable Seat)
2004	921 (With Fixed Seat)
2001-2003	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The Polaris 800 XC SP brake light circuit uses two distinct bulb types across its production run: the 3157 and the 921, both conforming to ANSI standards recognized in the United States and Canada.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W/7W output split, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary running light function.
The 921 is a single-filament T15 wedge bulb rated at 12V and 16W, a physically smaller form factor than the 3157 and without a secondary filament.
The 2001-2003 model years and the 2004 Fixed Seat configuration all use the 921 bulb, while the 2005 model year and the 2004 Adjustable Seat configuration use the 3157.
For the 2004 Polaris 800 XC SP, the correct brake bulb size is determined by seat type: the Adjustable Seat variant takes the 3157, and the Fixed Seat variant takes the 921.
The 3157 and 921 are not interchangeable. The T25 and T15 designations indicate different wedge base sizes, and the dual-filament wiring socket of the 3157 is electrically incompatible with the single-filament 921.