1、Applicable Models: Replacement for Polaris Rzr 170 2009 ‑ 2013; Replacement for Polaris Predator 90 2004 ‑ 2006; Replacement for Polaris Sportsman 90 2004 ‑ 2014; Replacement for Polaris Outlaw 90 2007 ‑ 2014, etc. 2、OEM Numbers: Replacing manufacturer part numbers are 0452954, 0451686. The chain tensioner is processed using advanced CNC cutting technology, guaranteeing OE standard. This ensures a precise and secure fit. 3、Sturdy Construction: The heavy duty chain tensioner is made from premium metal materials, ensuring maximum structural integrity. It is manufactured using advanced techniques such as die casting for enhanced durability. 4、Upgraded Tension Spring: Equipped with an upgraded torsion spring, this tensioner provides automatic tension adjustment to accommodate chain elongation. This ensures smooth rotation of the tensioner, resulting in a longer lifespan. 5、Easy Installation and Chain Protection: The tensioner is easy to install and helps protect the swing arm while providing proper chain guidance. This ensures optimal performance and extends the life of your chain.