The McCormick 3550907M91 is a genuine OEM spring designed for various agricultural applications. This essential component ensures proper function within compatible McCormick MC series tractors, including models MC80, MC90, MC95, MC100, MC105, MC115, MC120, MC130, and MC135. It is also an OEM equivalent for Massey Ferguson 4200 and 4300 series tractors, such as the MF 4215, 4220, 4225, 4235, 4240, 4245, 4255, 4260, 4265, 4270, 4315, 4320, 4325, 4335, 4345, 4355, 4360, and 4370 models. This spring provides reliable performance and durability, maintaining the integrity of your machinery's systems.