Polaris 440 Brake Bulb Size

The Polaris 440 brake light utilizes 921 and 90 bulb sizes for the lighting system. Data for the specified components covers the period from 1992 through 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
1993-1998	921
1992	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The 921 bulb is the brake bulb size for the Polaris 440 across the 1993-1998 model years.
The 921 is a T15 wedge-base bulb operating at 12 volts and 16 watts, conforming to ANSI standards for the US and Canadian markets.
The T15 designation refers to a tubular bulb with a width of 15 eighths of an inch, and the wedge base is a plastic pinch-style base that requires no locking mechanism to secure it in the socket.
The 1992 Polaris 440 uses the 90 bulb for the brake position, which differs from the type used in the 1993-1998 model years.
The 90 bulb is a single-filament type with a BA15s bayonet base, operating at 12 volts and 13 watts, also conforming to ANSI standards for the US and Canadian markets.
The BA15s bayonet base features a 15mm barrel with a single locating pin, which positions the bulb at a fixed rotational angle within the socket.
The 921 and 90 bulbs are not interchangeable, as they use different base types, a wedge base versus a bayonet base, and also differ in wattage output.