The McCormick 391338X1 is a genuine chain roller designed for various McCormick D-series tractors. This essential component ensures smooth operation and durability within the machinery's chain drive systems. With an outer diameter of 60 mm, an inner diameter of 20 mm, and a length of 30 mm, it provides precise fitment and robust performance. This part is suitable for models such as D212, D214, D217, D219, D320, D322, D324, D326, D430, D432, D436, D439, and D440. It is also cross-referenced as Case IH 391338X1 and 391338R1.