One New Aftermarket Replacement Muffler Fits Case – Fits International Tractor Models: 1066, 1466, 1566, 4366, 4386 Technical Information: Vertical/Oval Housing Dimension A(1) A: 12″ Inlet Length Dimension B(2) B: 3-3/4″ Inlet Inside Diameter Dimension C(3) C: 23″ Housing Length Dimension D(4) D: 8-3/4″ Outlet Length Dimension E(5) E: 3-1/2″ Outlet Outside Diameter Dimension F(6) F: 44″ Overall Length Replaces Part Number: 534546R6, 534546R3, 534546R5, 534546R1 Models This part fits: 1066, 1466, 1566, 4366, 4386 Reference numbers: 534546R3, 534546R3-A, 534546R6, 534546R6-A, A-534546R6, A-534546R6-A