This 2 pack Sixity XTA Axle kit fits your 2017, 2016, 2015, 2014, 2013 Polaris ACE 570 SP Sportsman 400 HO South Edition 450 EPS Utility 500 Touring Big Boss 6x6 Hunters X2 800 EFI ETX Forest Tractor (Front Left Right) and is perfect for a performance upgrade. The Sixity XTA Series Severe-Duty OE-replacement ATV/UTV axles are proven to deliver maximal durability and torque for extreme off-roading quads, 4-wheelers, and side-by-sides. Made from 4340 chrome-moly steel alloy for robust durability through the ultimate demanding terrain, Sixity XTA CV axles vastly outperform OEM axles in both quality and price.