Primal Gladiator's Kodohide Helm is part of the transmog set Primal Gladiator's Dragonhide Armor (Druid only), which the Appearances collection lists in 2 versions. The other 16 pieces:
Items Numbered Next to Primal Gladiator's Kodohide Helm
Blizzard numbers items as they are created, so the named items next to ID 115850 (115845 to 115855) were usually added in the same batch as Primal Gladiator's Kodohide Helm: the same quest line, zone, vendor or reward set.