13-1/2 INCH X 4MM DISC OPENER FOR GREAT PLAINSHas 53mm OD Bearing x 5 8 inch ID. Uses 205GPC Cap. Replaces 107 138S Interchange 864GP138, Net Weight (lbs) 6. 83 Length 13. 63 Width 13. 63 Height 1. 00 Brand AgSmart Make Type Model Great Plains Grain Drill Multiple PLANT WITH CONFIDENCE. Assembled in Jonesboro, Arkansas, SMA Disc Openers use only North American blades along with carefully selected components to continue to the field proven performance that the toughest Farmers expect. All openers