Description Vertical muffler for diesel tractors, fits engines D310, and D358. Inlet I.D. 2-15/16", outlet O.D. 3", length 42", oval body. Tractors: Hydro 86, 686, 706, 756, 2706, 2756, 826, 2856. This item is a suitable alternative for the following: 530588R4, IH22, IH-22, A530880R4, A-530880R4, 530588R91, 530588R2, 530588R1