These can be turned in to GM in POK of guild.. inside one of the houses near Freeport stone. Forgot excact name of NPC.. Not sure it's for anything else... I got a bit of Exp that's all
Don't know exactly how "Ultra" rare these things are, but I got these on a hate raid last night. I got there late, and only saw one spite, and he dropped these and the greaves. Both are fairly nice. I replaced my Jarsath gloves with these.
I'm not that lucky to show up for the last "shaman item" mob, and get an ultra rare item, so I bet they're a little more common than that.
In three hours of pulling last night we received 2 class armor pieces... one being an SK breastplate I think. The other being these gauntlets (which being the only shaman was most fortuitous for myself).
I don't find ultra-rare being too far-fetched, though we may have just been ultra-unlucky (myself not included =).