M90 Steering Gear Seal Kit Sheppard 5543551. Master seal kit Power steering gear box OE # 5543551, 5540331B, International #: 2502009C91. Sheppard M90 with snap ring cover or bolt cover style. First quality complete remplacement heavy duty power steering gearbox seal kit. Use to remanufactured heavy duty power steering gear box M90 for trucks, International, Navistar, Freigtliner, Kenworth, Mack.