Hey there - I have been exporting boss models for our kill videos for most of the bosses. So far I only need The Fallen Protectors and Nazgrim and I heard there is no specific model for them - just Pandaren/Orc with their specific armor. So far I couldn't find ANY clue what they are exactly wearing to gear them in the viewer. Has anyone of you some clues on that?
I would take a look at this. You can sort by armor type, and then just browse through the gallery view until you find something that looks right. However - I looked for Nazgrim's set and couldn't find anything exactly like it, so I think it's a unique asset for him.
EDIT: The poster above me knows what they are talking about more than I do. Listen to them. Haha.