1-3/8"-21 male spline, 1-1/8" female hex. For John Deere 6600, 6620, 7700, 7720, 9400, 9410, 9500, 9510 (2 used); 8820, 9600, 9610 (1 used on right side).
1-3/8"-21 male spline shaft with drive plate. Bolts to 14-tooth sprocket on feederhouse reverser. For John Deere 8820, 9600, 9610 (1 used on left side).