AH138200 Piston Seal for Thumb Cylinder fits John Deere 26G Excavator. This Piston is made to fit John Deere Cylinder AH216639. Other fitment: Model 26G: Application; Thumb Cylinder; Cylinder Number: AH216639 Model 30G: Application; Bucket Clamp Cylinder; Cylinder Number: AH216639. Not sure will this part fit? We can search quickly and confirm or find you the correct one! You need correct replacement? Just let us know and our parts specialist will help right away!