The Case IH 3399634R2 Guide Block is a genuine OEM component designed for various Case IH combine models. This essential guide block ensures proper alignment and smooth operation within the machinery. It is a direct replacement for part number 3399634R1, offering reliable performance and durability for demanding agricultural applications. Confirmed fitment for models including 1620, 1640, 1644, 1660, 1666, 1680, 1688, 2144, 2166, 2188, 2344, 2366, 2388, 2577, 2588, 5088, 6088, and 7088.