Ski-Doo MX Z 800 X Brake Bulb Size

The Ski-Doo MX Z 800 X brake light utilizes 1157, 921, and P21/5W bulb sizes depending on the specific version of the snowmobile. Data for the bulb sizes covers the range from 2001 to 2010.

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	US Type	EU Type	Shop
2008-2010	1157	P21/5W	Check Price
2007	921	W16W	Check Price
2001-2006	1157	P21/5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The 1157 is the dominant brake bulb type across the Ski-Doo MX Z 800 X, appearing in nine of the ten model years covered, specifically 2001-2006 and 2008-2010.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W/5W output, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary running light function.
The BAY15d bayonet base of the 1157 features two offset pins, a design that prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The 2007 Ski-Doo MX Z 800 X departs from the 1157 fitment, instead specifying the 921, a single-filament wedge-type bulb in a T15 form factor rated at 12V and 16W.
The 921 uses a wedge base rather than a bayonet base, making it physically incompatible with sockets designed for the 1157, and the two types are not interchangeable despite both operating at 12V.
The single-filament design of the 921 contrasts with the dual-filament 1157, meaning the 921 does not provide a secondary low-wattage circuit within the same bulb.
Both the 1157 and 921 are classified under ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances across manufacturers.
The wattage difference between the two types, 21W/5W for the 1157 versus 16W for the 921, reflects a meaningful variation in power draw that is relevant to the electrical load on the vehicle's braking circuit.