The McCormick 3678533M4 is a genuine OEM oil seal designed for various McCormick X-series agricultural tractors. This high-quality seal, with precise dimensions of 40mm inner diameter, 55mm outer diameter, and 8mm height, provides reliable sealing to prevent leaks and maintain system integrity. It is compatible with McCormick X4, X5, X6, X7, and X8 tractor models, including specific variants like X4.35, X5.50, X6.440, X7.460, and X8.680, ensuring a precise fit and long-lasting performance in demanding agricultural applications.