Polaris 500 XC SP Brake Bulb Size

The Polaris 500 XC SP brake utilizes bulb sizes 921, 2458, and 3157 across various production versions. Available information covers the specific time period from 1999 through 2007.

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
2007	921
2005-2006	3157
1999-2004	921

Bulb Specifications

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

Other Locations

Additional Notes

The 921 bulb is a single-filament wedge type (T15) rated at 12V and 16W, conforming to the ANSI standard recognized in the US and Canada.
The 3157 bulb is a dual-filament wedge type (T25) rated at 12V with a 27W/7W output, also conforming to the ANSI standard recognized in the US and Canada. The two wattage values correspond to its high- and low-intensity filaments.
The Polaris 500 XC SP uses the 921 bulb for the brake light across the 1999-2004 and 2007 model years.
The 2005-2006 model years specify the 3157 bulb for the brake light position, which differs from the 921 used in surrounding years.
The 921 and 3157 are not interchangeable. Beyond the physical size difference between the T15 and T25 wedge bases, the 3157 carries a dual-filament design while the 921 carries only a single filament, making the two electrically incompatible in brake light applications.
The wattage difference between the two bulbs is notable. The 921 draws 16W, while the 3157 draws up to 27W on its primary filament, which reflects a difference in circuit load for the years each bulb is specified.