Alloy USA Steel Differential Cover Model 20, Black Powder Coat 11205 For Use On AMC Model 20 Rear Axles;3/8in. Thick Cast Steel;Heavy Duty ReinForcement Ribs For Added Strength;Includes Filler Plug and Bolts;Gasket not included Alloy USA Alloy USA AMC Model 20 Iron Cover - 11205 11205 Differential Covers