One New Aftermarket Replacement Cylinder Seal Kit Fits Komatsu Excavator Boom / Bottom Dump Models: Boom (Slf): Pc200-5, Pc200Lc-5 (Cylinder: 206-63-02100, After Serial Number 45001>) Boom: (Pc200-6, Pc200Lc-6, Pc210Lc-6, Cylinder: 206-63-02501, After Serial Number A80001>, After Serial Number A82001>), (Pc210-6, Pc210Lc-6, Cylinder: 206-63-54141, After Serial Number A82001>), (Pc220-5, Pc220Lc-5, Cylinder: 206-63-02100, After Serial Number 35001>), (Pc220-6, Pc230-6, Cylinder: 206-63-02501, Between Serial Numbers 40001 - 52851, Cylinder: 206-63-07100, Between Serial Numbers 50001 - 52851), (Pc220Lc-6, Cylinder: 206-63-02501, Between Serial Numbers 50001 - 52851), (Pc220Lc-6, Cylinder: 206-63-07100, Between Serial Numbers 50001 - 52851) Bottom Dump (L/S): Pc400-6 (Cylinder: 208-63-03150) All OEM part numbers and logos are to be used for identification purposes only