The McCormick 1966181C1 is a genuine OEM shim designed for precise spacing and adjustment in a wide range of McCormick agricultural tractors, including CX, MC, MTX, X-series, and ZTX models. This critical component helps maintain optimal clearances and reduce wear between moving parts. With a thickness of 0.25 mm and dimensions of 50.8 mm x 50.8 mm, it ensures accurate fitment and reliable performance. Also cross-referenced as Case IH 1966181C1 and New Holland 1966181C1.