The McCormick 4208901M91 is a genuine OEM lower engine gasket set designed for McCormick X4.20, X4.30, X4.40, X4.50, X5.35, X5.45, and X5.55 series agricultural tractors. This comprehensive kit includes all necessary gaskets and seals for the lower part of the engine, ensuring a complete and reliable repair or overhaul. Manufactured to original equipment specifications, it guarantees optimal fit and performance, preventing leaks and maintaining engine integrity.