Primal Gladiator's Wyrmhide Legguards 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 Wyrmhide Legguards
Blizzard numbers items as they are created, so the named items next to ID 115859 (115854 to 115864) were usually added in the same batch as Primal Gladiator's Wyrmhide Legguards: the same quest line, zone, vendor or reward set.