Boss Bearing 41-4090-9E6 Rear Wheel Bearing Kit Polaris Sportsman 550 and 550 EPS 2011-2013 Kit Contains: 1 Bearing This replaces one rear bearing. If you need to replace both rear bearings, please order 2. 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.