Polaris 700 XC Brake Bulb Size

The Polaris 700 XC brake light utilizes 3157 and 921 bulb sizes for the lighting system. Data for the specific components covers the period from 1997 through 2004.

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
2004	3157 (With Adjustable Seat)
2004	921 (With Fixed Seat)
2003	921
1997-1999	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 921 is the most frequently specified brake bulb across the Polaris 700 XC fitment data, appearing across 1997-1999 and 2003 model years, as well as one configuration of the 2004 model year.
The 921 is a single-filament wedge bulb rated at 12V and 16W, conforming to the T15 form factor under the ANSI standard applicable in the US and Canada.
The 3157 is a dual-filament wedge bulb rated at 12V with a 27W main filament and a 7W secondary filament, conforming to the T25 form factor under the same ANSI standard.
The dual-filament design of the 3157 allows it to serve two brightness levels from a single bulb, which is a functional distinction from the single-filament 921.
For the 2004 Polaris 700 XC, the correct brake bulb depends on seat configuration: the 3157 is specified for the adjustable seat variant, while the 921 is specified for the fixed seat variant.
The 921 and 3157 are not interchangeable despite both being wedge-base bulbs, as they differ in filament count, wattage, and physical form factor (T15 versus T25).