The YANMAR IMPELLER KIT 128990-42570 replaces old part number 128990-42200.So, this kit replaces part numbers 128397-42200 and 128990-42200, and contains: - 1 X 128990-42200 Impeller - 1 X X02173476 O-ring - 6 X 128990-42520 Screw - 1 X Impeller lube