13-1/2 INCH X 3MM TYE HD DRILL DISC ASSEMBLY13 1 2 inch x 3mm HD Disc Opener Assembly, 5 8 inch ID Ball Bearing (204PY2) and 1 4 inch Rivets. Replaces 550 647. Interchange 864TY647H, Net Weight (lbs) 5. 63 Brand AgSmart Make Type Model John Deere Grain Drill 1060 John Deere Grain Drill 450 John Deere Grain Drill 770 John Deere Grain Drill 780 John Deere Grain Drill 8000 John Deere Grain Drill 8000 Series John Deere Grain Drill 8300 John Deere Grain Drill 8350 John Deere Grain Drill 8500 John