Boss Bearing P-ATV-RR-2J6 Both Rear Wheel Bearings Ranger RZR 800 2008-2011 Kit is the aftermarket replacement for Polaris part # 3585502. Kit Contains: 2 Bearings All Bearings feature low-drag double lip rubber seals on both sides. Double sealed bearings outperform metal shielded bearings because they keep out dirt and water.