This axle is compatible with the following 4X4 models:<br/><br/>This axle has 28 teeth on the inboard spline that goes into the differential. Please verify your axle has 28 teeth on the inboard spline. <br/><br/>2015 Polaris Hawkeye 325<br/><br/>2016 – 2021 Polaris Sportsman 450 HO<br/><br/><br/>2015 - 2022 4X4 Polaris Sportsman 570<br/><br/>2015 – 2016 Polaris Sportsman ETX<br/>