Brand New (6) Pack of Oregon Mower Blades… Fits John Deere Part #’s M139975Gator G3Length: 21-7/16″Center Hole: 13/16″Width: 2.50Thickness. 203Lift: 3/4″Offset:13/16″ Oregon Part # 91-604. 6 Pack Oregon 91-604 Mower Blade Gator G3 Fits John Deere M139975. Brand New (6) Pack of Oregon Mower Blades.. Fits John Deere Part #’s M139975. Oregon Part # 91-604. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.