The John Deere R304931 Guide is a genuine OEM component designed for various John Deere engines, including the 4039, 4045, 6059, 6068, 6076, 6081, 6090, 6105, 6125, 6135, 6466, and 6619 series. This essential engine part ensures proper function within the cylinder block assembly. Manufactured to John Deere's rigorous standards, it provides reliable performance and precise fitment for maintaining engine integrity. With dimensions of approximately 95 mm length, 51 mm width, and 51 mm height, and a weight of 0.12 kg, this guide is built for durability and long service life in demanding agricultural and industrial applications.