Ski-Doo MX Z X-RS Brake Bulb Size

Ski-Doo MX Z X-RS brake bulb uses a P21/5W size for replacement applications. The chart covers 2011 to 2013 production years with corresponding bulb size specifications.

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
2011-2013	P21/5W

Bulb Specifications

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

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Additional Notes

The P21/5W is the brake bulb type specified for the Ski-Doo MX Z X-RS across the 2011-2013 model years.
P21/5W is an ECE-regulated standard used in Europe and internationally, operating on a 12-volt system with a dual-filament design rated at 21 watts and 5 watts respectively.
The dual-filament construction allows one filament to handle braking signals at the higher 21-watt output while the second filament operates at 5 watts, typically serving a running or tail light function within the same bulb housing.
The P21/5W uses a BAY15d bayonet base, which is an offset twin-pin fitting. The asymmetric pin placement of the BAY15d base is a deliberate design feature that prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
Because the BAY15d base is offset, it is not interchangeable with the BA15d base, which carries the same pin count but with symmetrical placement. Substituting a BA15d bulb in a BAY15d socket would result in incorrect fitment.