Primal Gladiator's Ringmail Footguards 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 Ringmail Footguards
Blizzard numbers items as they are created, so the named items next to ID 115929 (115924 to 115934) were usually added in the same batch as Primal Gladiator's Ringmail Footguards: the same quest line, zone, vendor or reward set.