Polaris Classic Brake Bulb Size

The Polaris Classic brake utilizes bulb sizes 921 and 90 for the specific lighting components located on the rear of the vehicle. Data for the specified equipment covers the range from 1988 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
1993-1998	921
1988-1992	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 Polaris Classic uses two distinct brake bulb types across its model years: the 921 and the 90, both of which conform to ANSI standards recognized in the US and Canada.
The 921 is a T15 wedge bulb rated at 12V and 16W. The wedge base design means the bulb is held in place by friction rather than a locking mechanism, requiring no rotation during installation or removal.
The 90 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 13W. The BA15s designation indicates a single-contact bayonet fitting with a 15mm base, which locks into its socket with a twist.
The 921 and the 90 use fundamentally different base types, a wedge versus a bayonet, making them physically incompatible with each other's sockets despite sharing the same operating voltage of 12V.
The Polaris Classic (1993-1998) takes the 921 bulb for the brake light position, while the 1988-1992 model years use the 90 bulb in the same position.
The wattage difference between the two bulbs is notable: the 921 draws 16W compared to the 90's 13W, meaning the two are not electrically equivalent and substituting one for the other could affect circuit load.