Ultimax 3 has evolved into Ultimax Pro Belt features a thicker cross section so more surface area contacts the clutch; this means less slippage over a broader speed range for quicker acceleration New cog design dissipates heat and aids flexibility Cooler running belts mean better performance and longer lasting belts Run cool, run long, run fast with Ultimax Pro This item fits the following applications: 1998 Ski-Doo Grand Touring 800 SE 1998 Ski-Doo Grand Touring 700 1998 Ski-Doo Formula III 600 LT 1998 Ski-Doo Formula III 700 1998 Ski-Doo Formula III 600 1998 Ski-Doo Mach 1 1998 Ski-Doo Mach Z LT 1998 Ski-Doo Mach Z