One New Aftermarket Replacement Muffler to fit Massey Ferguson Tractor Models: 1085 (Diesel), 285 (Vertical Exhaust & 318 Engine). Vertical/Oval Body – Shell Size 6″ X 10″. Dimension A (1) A: 2 1/2″ Inlet Length Dimension B (2) B: 2 3/4″ Inlet ID Diameter Dimension C (3) C: 17 1/2″ Body Length Dimension D (4) D: 4 1/2″ Outlet Length Dimension E (5) E: 2 3/4″ Outlet ID Diameter Dimension F (6) F: 24″ Overall Length Replaces Part Number: 535950M1, 539950M1, 539950M92, 529390M94, 535950M91, 529390M91, MF- 37, MF37, 30101V91, A535950M1 Models this part fits: 1085, 285 Reference Numbers: 529390M94, 529390M94-A, 535950M1, 535950M91, 535950M91-A, 539950M1, 539950M92, 539950M92-A, A-535950M1, A-535950M1-A, S.43984, S.43984-A