One New Aftermarket Replacement Muffler that fits Massey Ferguson Industrial Construction Models: 20B, 20E and also fits Massey Ferguson Tractor Models: 230, 231, 240, 250, 255, 340, 342, 350, 352, 355, 372, 550 UK (SN 620661) Dimensions: – Dimension A (1) A: 6 1/2″ INLET LENGTH – Dimension B (2) B: 2 1/8″ INLET DIAMETER – Dimension C (3) C: 17 1/2″ SHELL LENGTH – Dimension D (4) D: 26 1/2″ OUTLET LENGTH – Dimension E (5) E: 1 5/8″ OUTLET DIAMETER – Dimension F (6) F: 50 OVERALL LENGTH 5/8″ Replaces Part Numbers: 1683796M3, 1661930M1, 1680260M2, 1683796M1, 1683796M2. Models this part fits: 20B, 20E, 230, 231, 240, 250 Reference Numbers: 1661930M1, 1680260M2, 1683796M1, 1683796M2, 1683796M3, 1683796M3-A, A-1661930M1, A-1661930M1-A, S19253, S19253-A