Polaris 700 XC SP Brake Bulb Size

The Polaris 700 XC SP uses 3157 and 921 bulb sizes for brake applications, with each size serving specific lighting functions on the snowmobile. The replacement chart covers 1999 to 2005 production years and details bulb size specifications for brake systems across this model range.

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	3157	P27/7W	Check Price
2004	3157 (With Adjustable Seat)	P27/7W	Check Price
2004	921 (With Fixed Seat)	W16W	Check Price
1999-2003	921	W16W	Check Price

Bulb Specifications

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

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Additional Notes

The Polaris 700 XC SP uses two distinct brake bulb types across its production years: the 3157 and the 921, both of which conform to ANSI standards recognized in the United States and Canada.
The 921 is a single-filament wedge bulb in the T15 form factor, rated at 12V and 16W. It appears across the 1999-2003 model years as the sole brake bulb specification.
The 3157 is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W/7W output split between its two filaments. The dual-filament design allows one filament to serve a lower-intensity function and the other a higher-intensity function within the same housing.
The T25 form factor of the 3157 is physically larger than the T15 form factor of the 921, which means the two bulb types are not interchangeable despite both using wedge-base construction.
The 2004 Polaris 700 XC SP carries a seat-configuration-dependent split: the adjustable seat variant takes the 3157, while the fixed seat variant takes the 921.
The 2005 model year specifies only the 3157, with no seat-configuration distinction noted.
The wattage difference between the two bulb types is notable. The 921 draws 16W on a single filament, while the 3157 draws up to 27W on its primary filament, reflecting a higher output requirement in the applications where it is specified.