The McCormick 6665278A1 is a genuine OEM spring designed for various McCormick and Landini tractor models. This essential component ensures proper function and durability in demanding agricultural applications. It is compatible with McCormick X6.420, X6.430, X6.440, X6.460, X7.440, X7.450, X7.460, X7.650, X7.660, X7.670, X7.680, X8.660, X8.670, X8.680, and Landini 6-120C, 6-130C, 6-140C, 7-140, 7-150, 7-160, 7-170, 7-180, 7-210, 7-230, 7-240 tractors.