One new aftermarket replacement muffler that fits Massey Ferguson tractor models: 230, 240, 250, 255, 340, 342, 350, 352, 355, 360, Ind. 20B, 20D, 20E Dimensions: Vertical, Black Oval (2 1/16″ Inlet x 52 1/4″ Long) Replaces Part Numbers: 3772137M1, 1683796M1, 1683796M2, 1683796M3, 1688171M6, 3821781M91 Models This Part Fits: 20B, 20D, 20E, 230, 240, 250, 255, 340, 342, 350, 352, 355, 360 Reference Numbers: 1683796M1, 1683796M2, 1683796M3, 1688171M6, 3772137M1, 3821781M91