All Balls Racing Front Differential Roller Sprague Kit Polaris The Roller Sprague Kits from All Balls Racing come prepared for installation, outperforming both OEM and several aftermarket models in durability. By employing 7075 aluminum bearing cages, these kits guarantee lifespan that outperforms the 6061 aluminum upgraded alternatives and any OEM plastic cages. The kit even features a practical plastic sleeve that maintains the position of the rollers for simpler installation. Fitment: Not for 2017 RZR 900 S models built after 08/29/16 Fits 50 versions only of RZR 900 2018-2020, RZR 900 Eps2018-2020, RZR 900 Md2017 Fits 60 versions only of RZR 900 2018-2019 Fits 60 versions only RZR 900 S 2020 Features: Upgraded 7075 aluminum bearing cage Greater longevity and increased strength over aftermarket 6061 aluminum alternatives Superior to plastic bearing cages used by OEMs Fully assembled with a plastic retainer sleeve holding the rollers together for easy installation Hard-coated aluminum bearing cage for strength and durability Replaces OEM Part Numbers 3234394, 3234466, 3234591, 3234907, 3235261