One New Aftermarket Replacement Muffler that fits Allis Chalmers Tractor Models: B, IB, C, and CA (All Thru Hood – 1938-1957), (D10, D12, D14, D15, All with Gas Engines, SN: Vertical/Round Body – 3 1/4″ Shell Diameter Includes Brackets – 1 for Head Bolt and 1 for Manifold Dimensions: Dimension A(1) A: Inlet Port Length 2 1/2″ Dimension B(2) B: Inlet Port ID 1 3/8″ Dimension C(3) C: Shell Length 16 1/2″ Dimension D(4) D: Outlet Port Length 10″ Dimension E(5) E: Outlet Port ID 1 1/2″ Dimension F(6) F: Overall Length 29″ Replaces Part Numbers: 70227240, 70233450, 233450, A-70227240 Models this part fits: BC CA, D10, D12, D14, D15 Reference Numbers: 227240, 233450, 70227240, 70227240-A, A-70227240, A-70227240-A