Description Vertical muffler for diesel tractors, fits engines DT414, DT436, DT466. Inlet I.D. 3-3/4", outlet O.D. 3-1/2" , length 44", oval body. Tractors: 1066, 1466, 1566, 4366, 4386 (to s/n 2500). This item is a suitable alternative for the following: 534546R5, 534546R1, 534546R6, 534546R91, IH26, A493759, A-534546R6, A534546R6, IH-26