One fits John Deere Replacement Vertical Muffler that fits Diesel Tractor models: 3010 (after serial number 6644), 3020 (before serial number 122999), 4010 (after serial number 7027), and 4020 (before serial number 200999) Notes Vertical/Round Housing – 6″ Shell Diameter. Intake Port is flared, uses DR300 clamp Dimension A(1) A: INLET LENGTH 3″ Dimension B(2) B: INLET BODY DIAMETER 2 15/16″ Dimension C(3) C: SHELL LENGTH 20″ Dimension D(4) D: 3″ This part fits models: 3020, 4010, 4020 Reference Numbers: AR30189, AR30189-A, AR30190, AR30190-A, DR-22, DR-22-A