One new replacement muffler for gas and LPG engines fits John Deere tractor models: 3010, 3020, 4000, 4010, 4020, 4520, 4620, 5010, 5020, 7020, 8430, 8440, 8630, 8640. Technical information: 2-15/16″ inlet ID, 2-5/8″ outlet OD, 26″ OD length, 3″ inlet length, 3″ outlet length, 2-15/16″ shell length. Replaces Part Number: AR26640, AR26786 Models This part fits: 3010, 3020, 4000, 4010, 4020, 4520, 4620, 5010, 5020, 7020, 8430, 8440, 8630, 8640 Reference Numbers: AR26640, AR26640-A, AR26786, AR26786-A, DR-21, DR-21-A, R1081, R1081-A