The McCormick 210823 rocker arm is a critical engine component designed for various McCormick D-series tractors. This genuine replacement part ensures accurate valve timing and optimal engine performance. It is compatible with models including D210, D212, D214, D215, D217, D219, D320, D322, D324, D326, D430, D432, D436, D439, D440, DLD2, DED3, and DGD4. Manufactured to OEM specifications, this rocker arm provides reliable and durable operation for your agricultural machinery.