Primal Gladiator's Linked Helm is part of the transmog set Primal Gladiator's Ringmail Armor (Shaman only), which the Appearances collection lists in 2 versions. The other 16 pieces:
Items Numbered Next to Primal Gladiator's Linked Helm
Blizzard numbers items as they are created, so the named items next to ID 115938 (115933 to 115943) were usually added in the same batch as Primal Gladiator's Linked Helm: the same quest line, zone, vendor or reward set.