This genuine OEM McCormick 4207755M91 spring is a critical component for various McCormick and Massey Ferguson tractor models. Manufactured to precise specifications, it ensures reliable operation and proper tension within the machinery. Confirmed fitment includes McCormick X4, X5, X6, X7, X8 series and numerous Massey Ferguson 4700, 5700, 6700, 7700, and 8700 series tractors. With a length of 100 mm, a diameter of 18 mm, and a wire diameter of 2.5 mm, this spring weighs 0.05 kg.