The McCormick 3674321M91 is an authentic OEM left side marker light designed for various McCormick tractor models. This essential lighting component provides crucial side visibility, enhancing safety during operation, especially in low-light conditions. Manufactured to original equipment specifications, it ensures a perfect fit and reliable performance, maintaining the integrity of your tractor's electrical system and exterior. Replace your damaged or non-functional marker light with this genuine McCormick part to restore optimal visibility and meet operational safety standards.