Read from the World of Warcraft client build files.
How Honorforged Greathelm Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Honorforged Greathelm suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Similar Items
The 4 items nearest to Honorforged Greathelm (item level 13) in item level among Armor > Plate, Head slot, from item level 22 to 23.
Blizzard numbers items as they are created, so the named items next to ID 240298 (240293 to 240303) were usually added in the same batch as Honorforged Greathelm: the same quest line, zone, vendor or reward set.