The Case IH A178329 is a genuine OEM adjustment shim, precisely engineered with a thickness of 10.64 mm (0.419 inches), an inner diameter of 50.8 mm (2.00 inches), and an outer diameter of 76.2 mm (3.00 inches). This critical component ensures proper spacing and alignment in various Case IH agricultural machinery, including 7100, 7200, 8900, and MX series tractors, 1600, 2100, 2300, and 2500 series combines, 1800, 2000, 2100, and 2500 series cotton pickers, 8810 forage harvesters, and 8800 series windrowers.