Mower Blade 21.12" long x .2.50" wide x 42"ID hole. CW. 15-1006 . 27-2720 202720 supersedes to 20-2720-03. This blade is stamped 20-2720 and W03730. New OEM Toro part number 20-2720.
Mower Blade 20.50" long x 2.50" wide x .75"ID center hole, outer holes .38"ID. CW. 1720679 supersedes to 1687014. This is part number 1720679 new OEM Simplicity.