Boss Bearing P-ATV-RR-2J6-4 Both Rear Wheel Bearings Sportsman 500 4x4 HO 2001-2008 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.