Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Heroes' Dreadnaught Legguards Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Heroes' Dreadnaught Legguards suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Heroes' Dreadnaught Legguards is part of the transmog set Heroes' Dreadnaught Battlegear (Warrior only). The other 16 pieces:
Items Numbered Next to Heroes' Dreadnaught Legguards
Blizzard numbers items as they are created, so the named items next to ID 39612 (39607 to 39617) were usually added in the same batch as Heroes' Dreadnaught Legguards: the same quest line, zone, vendor or reward set.