The Spectral Horse Tack is a boss drop from Goshnar's Hatred. The item is needed for the Phantasmal Jade mount:
"Use 4 Spectral Horseshoes, a Spectral Horse Tack and a Spectral Saddle after completing the Soul War Quest."
The other mount items are drops from other bosses. The Spectral Saddle is a boss drop from Goshnar's Cruelty. And the Spectral Horseshoe is a boss drop from Goshnar's Malice.
Sources:
Its one of the items necessary to obtain the Phantasmal Jade Mount
The way to obtain this Horse is to use 4 Spectral Horseshoes, a Spectral Horse Tack and a Spectral Saddle after completing the Soul War quest This Item is looted by the bosses of the Soul War quest Source: I know a person who does the soul war quest services and have gotten several of the parts of the mount
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