Read from the World of Warcraft client build files.
How Deathguard's Helm Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Deathguard's Helm suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Similar Items
The 8 items nearest to Deathguard's Helm (item level 60) in item level among Armor > Plate, Head slot, from item level 50 to 60.
Deathguard's Helm 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:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Deathguard's Helm Fits
Other Items Named Deathguard's Helm
1 other item in the current build is also called Deathguard's Helm. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 165491 (165486 to 165496) were usually added in the same batch as Deathguard's Helm: the same quest line, zone, vendor or reward set.