Each class has 5 epic pieces in their set: three armor pieces, a necklace, and a trinket. The Primal Hakkari items required for the "Revered" piece (Aegis, Kossack, and Tabard) drop at the lowest rate and are rarely seen except as drops from Bloodlord Mandokir and Jin'do the Hexxer.
This is information for the armor pieces of the sets. For information on the full sets see Zandalar Tribe set.
Prior to Patch 1.11, various combinations of Hakkari Bijous and Zul'Gurub Coins that drop from the various mobs in ZG were also required for these pieces, but it was changed to only require the Primal Hakkari item. Also, the rare armor pieces were upgraded to epic, with appropriate stats.