Anti-Tip Unit Brkt Assy, SVCE (Pro Series,DF,GR)
  NOTE:    For Wall/Floor Mount Bracket See 821261
Pro Series Use Starting With Serial #18022050.
           From #17287990 to #18022050 See 821262.
           Prior to Serial #17287990 See Manual
DF30/48/60 Use Starting With Serial #18021738.
           From #17287990 to #18021738 See 821262.
           Prior to Serial #17287990 See Manual
  DF36     See 821327
  NOTE:    For 5/8-11 X 4.00 Bolt See 820609