Read from the World of Warcraft client build files.
How Juggernaut Breastplate Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Juggernaut Breastplate suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Juggernaut Breastplate is part of the transmog set Juggernaut Battlegear (Warrior only), which the Appearances collection lists in 4 versions. The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Juggernaut Breastplate Fits
Other Items Named Juggernaut Breastplate
1 other item in the current build is also called Juggernaut Breastplate. 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 247212 (247207 to 247217) were usually added in the same batch as Juggernaut Breastplate: the same quest line, zone, vendor or reward set.