The McCormick 3555821M1 is a genuine OEM spring designed for various McCormick agricultural tractors. This essential component ensures proper function and durability within the specified machine systems. It is compatible with a wide range of McCormick models including the MC series (MC80-MC135), MTX series (MTX90-MTX200), X6 series (X6.420-X6.440), X7 series (X7.440-X7.P690), and X8 series (X8.660-X8.6VT). Manufactured to McCormick's exacting standards, this spring provides reliable performance and a precise fit.