Kawasaki KAF820 Mule PRO-FX Tail Light Bulb Size

The Kawasaki KAF820 Mule PRO-FX tail light utilizes a P21/5W bulb size for the lighting system. Available data for the specific component covers the period from 2016 through 2022.

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
2021-2022	P21/5W
2016-2019	P21/5W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

Other Locations

Additional Notes

The Kawasaki KAF820 Mule PRO-FX uses the P21/5W bulb for its tail light across the 2016-2022 model years.
The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The higher 21W filament serves the brake or turn signal function, while the lower 5W filament handles the running light function.
The P21/5W operates on a 12V electrical system, which is consistent with standard automotive and utility vehicle electrical architectures.
This bulb follows the ECE (Economic Commission for Europe) standard, a regulatory framework recognized across Europe and many other markets worldwide.
The P21/5W uses a BAY15d bayonet base. The BAY15d designation indicates an offset dual-contact base, where the two pins are positioned at different heights to prevent incorrect installation orientation.
The offset pin design of the BAY15d base means the bulb is not interchangeable with the BA15d base, which shares the same physical size but has pins at equal heights. Substituting one for the other is not possible without modification.