The Polaris Genuine NOS ATV Sportsman 800 EFI Rear Right Spindle Knuckle 5631540 is a high-quality replacement part specifically designed for Polaris ATVs. This spindle knuckle is a genuine OEM part from Polaris, ensuring a perfect fit and reliable performance. It is compatible with Polaris ATV models and is designed to provide durability and functionality for your machine. Whether you are replacing a broken spindle knuckle or upgrading your ATV, this genuine Polaris part is a great choice for maintaining your vehicle's performance.