Grate,Flr Assy-Dual Fuel,SVCE (DF304,GR304)
  DF      Use Regardless Of Serial Number
 ICBDF304 Use Prior to Serial #17315542
          Starting With #17315542 See 826699
  GR304   Use Prior To Serial #18488614
          Starting With #18488614 See 829217
  SRT304  Use Prior to Serial #18483782
          Starting With #18483782 See 829217