Read from the World of Warcraft client build files.
How Deathguard's Sabatons Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Deathguard's Sabatons suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Deathguard's Sabatons is part of the transmog set Deathguard's Battleplate (Warrior, Paladin and Death Knight only), which the Appearances collection lists in 2 versions. The other 11 pieces:
Blizzard numbers items as they are created, so the named items next to ID 165489 (165484 to 165494) were usually added in the same batch as Deathguard's Sabatons: the same quest line, zone, vendor or reward set.