One new replacement muffler to fit Allis Chalmers tractor models: D15 (WITH DIESEL ENGINE – SN 9001), D17 (WITH DIESEL ENGINE – SN 38964). Vertical/Round Body – 3 1/4″ Shell Diameter Dimension A(1) A: 3″ INLET LENGTH Dimension B(2) B: 3″ X 4 1/8″ MAIN PLATE Dimension C(3) C: 16 1/2″ SHELL LENGTH Dimension D(4) D: 6 1/2″ OUTLET LENGTH Dimension E(5) E: 2 1/4″ Outlet OD Dimension F(6) F: 26″ OVERALL LENGTH Replaces Part Numbers: 70234493, 234493, AC-6 EQ Models This part fits: D15, D17 Reference Numbers: 234493, 70234493, A-70234493, A-70234493-A