Whole Machine hydraulic cylinder seal kit for John Deere 490E Excavator for all 4 standard equipment cylinders, 2 Boom, 1 Arm & 1 Bucket. This kit includes the rod bushings and piston wear rings which are not always included in OEM kits and other aftermarket kits. We are Fox Machine, Inc. Of Norway ME USA, If you have any questions please contact Dean at FoxKits seal kit store. Never attempt to service a pressurized cylinder, or a cylinder connected to a load, never use air or hydraulic pressure to disassemble a cylinder.