Primal Gladiator's Mail Spaulders 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 Mail Spaulders
Blizzard numbers items as they are created, so the named items next to ID 115946 (115941 to 115951) were usually added in the same batch as Primal Gladiator's Mail Spaulders: the same quest line, zone, vendor or reward set.