Boss Bearing K-MULE-RR-500-550-4C5-A-1 Rear Axle Bearings and Seals Kit Kawasaki Mule 550 1997-2004 Kit Contains: 2 Bearings and 2 Seals 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. All Seals are double lip and rubber encapsulated with internal stainless garter spring for maximum sealing performance. A FREE helpful installation tip sheet will be included in all wheel and axle kit purchases.