Read from the World of Warcraft client build files.
How Demonic Combatant's Scaled Helm Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Demonic Combatant's Scaled Helm suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Demonic Combatant's Scaled Helm is part of the transmog set Fierce Combatant's Scaled Armor (Paladin only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Demonic Combatant's Scaled Helm Fits
Other Items Named Demonic Combatant's Scaled Helm
1 other item in the current build is also called Demonic Combatant's Scaled Helm. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Demonic Combatant's Scaled Helm
Blizzard numbers items as they are created, so the named items next to ID 150135 (150130 to 150140) were usually added in the same batch as Demonic Combatant's Scaled Helm: the same quest line, zone, vendor or reward set.