Polaris FST SwitchBack Brake Bulb Size

The Polaris FST SwitchBack brake uses a 1157 bulb size for the lighting component. Data for the specific bulb requirements covers the range from 2006 to 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	US Type	EU Type	Shop
2006-2007	1157	P21/5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price

Other Locations

Additional Notes

The 1157 is an ANSI-standardized bulb used in both the United States and Canada. It operates on 12 volts and carries a dual-filament design rated at 21 watts and 5 watts, where the higher-wattage filament serves the brake function and the lower-wattage filament serves a secondary role such as running light operation.
The 1157 uses a BAY15d bayonet base, a two-pin offset base type. The offset pin placement is a deliberate anti-rotation feature that ensures the bulb seats in only one orientation, which keeps each filament aligned with its intended circuit.
The Polaris FST SwitchBack uses the 1157 bulb size for the brake light position across the 2006-2007 model years.