Mother Clutcher made as an OE style Polaris primary (aka drive) clutch made specific for ALL 2017-2019 Polaris Ace 900 models including XC. This clutch gets rid of rough/jerky take-off problems original clutches had! Also stops vehicles from making clicking/popping sounds on deceleration and coasting! Comes correct for ready to bolt on and ride with weights and spring already in it! This clutch is made and pre-tuned just for Ace 900, unlike other aftermarket ones. We spend a good amount of time testing and revising these clutches to make sure they have smooth and responsive performance. FITMENT: FITS ALL PACKAGES OF 2017-2019 Polaris ACE 900. Manufacturer Part Number: replaces 1323283 1323308 1323130