One New Aftermarket Replacement Muffler Fits Massey Ferguson Tractor Models: Mf150 (Continental Gas, Perkins Gas and Diesel w/Alternator), Mf165, Mf175, Mf180, Mf240 (Up to Serial #2773N01001), Mf245, Mf255, Mf265, Mf275. Round, for Gasoline and Diesel Engines. 2″ Inlet ID, 2″ Outlet OD, 32″ OD Length, 3-1/4″ Diameter. Replaces Part #: 539523M92. Models this part fits: 265 245 230 255 250 275 240 150 135 539523M92, MF150, MF165, MF175, MF180, MF240, MF245, MF255, MF265, MF275. Reference Numbers: 522589M91, 522589M91-A, 539523M92.