Description Muffler, vertical, oval. 2-1/8" inlet ID, 2" outlet OD, 37" OA length, 3-1/4" diameter. Tractors: MF245, MF255, MF265, MF275. This item is a suitable alternative for the following: 578090M92, 1462676M91, 535389M91, 578090M91, A-578090M1, MF38, MF-38, A578090M1