Polaris Ultra Brake Bulb Size

The Polaris Ultra brake light requires a 921 bulb size for the specific lighting components located at the rear of the vehicle. Data for the bulb specifications covers the range from 1997 to 1998.

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
1996-1998	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is the sole brake bulb type listed for the Polaris Ultra across the 1996-1998 model years.
The 921 is an ANSI-standardized bulb recognized in both the United States and Canada, which reflects a North American fitment standard rather than a global one.
The bulb operates on a 12-volt electrical system and draws 16 watts, which is typical of incandescent stop lamp applications in small powersports vehicles of that era.
The T15 wedge base design means the bulb is retained by friction within its socket rather than by a bayonet twist-lock mechanism, making it a tool-free replacement in most housings.
The wedge base format of the 921 is not universally interchangeable with bayonet-base bulbs such as the 1156 or 1157, even when wattage ratings are similar, due to the differing socket types.