All of our new parts are aftermarket replacements. Compatible with John Deere Combine(s) 6600 (Cylinder, Intermediate Shaft), 6620 (Drive, Torq-Sensing Countershaft), 6622 (Drive, Torq-Sensing Countershaft), 7700 (Cylinder, Intermediate Shaft), 7720 (Drive, Torq-Sensing Countershaft), 8820 (Drive, Torq-Sensing Countershaft). Replaces John Deere OEM Number(s) H113749, H75565. Type: Raw Edge Cogged (REC). All States Ag Parts Item No.