Ski-Doo MX Z X-RS Tail Light Bulb Size

The Ski-Doo MX Z X-RS tail light uses a P21/5W bulb size for this snowmobile model. A replacement chart covering 2011 to 2013 contains vehicle production years and 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

Other Locations

Additional Notes

The P21/5W is the tail light bulb type specified for the Ski-Doo MX Z X-RS across the 2011-2013 model years.
P21/5W is a dual-filament bulb, with one filament rated at 21 watts and a second rated at 5 watts, allowing it to serve two distinct lighting functions within a single unit.
The bulb uses a BAY15d bayonet base, which is an offset twin-pin fitting. The asymmetric pin placement of the BAY15d prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
P21/5W is governed by ECE regulations, a standard recognized across Europe and numerous other markets worldwide, establishing consistent performance and construction requirements for the bulb type.
The bulb operates on a 12-volt electrical system, which is standard for powersport and automotive applications of this class.
Because the BAY15d base is specific to dual-filament applications, it is not interchangeable with single-filament bayonet bases such as the BA15s, and substitution with an incompatible base type would result in a fitment failure.