A new exhaust muffler by AP as pictured to fit 1926-37 Models as follows: A1, A2, B2, AW1, AW2, C10, C20, CS20, M2, M3, 3/4- 1 1/2 ton. Muffler has some rust but solid and dent free. 1 3/4" I.D. inlet and outlet. 5 " diameter round, 25 1/4" on the barrel, 27 1/2" overall. center in and center out.