Hello there. I saw a request for this swap and I think I have seen it multiple times, so here it is. The Armored brown bear you buy in dalaran to the amani war bear. Enjoy!
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EDIT: I would like to add for anyone thinking that sitting further into the warbear mount is a model edit bug/error, I am sad to say it is not. I have a real amani war bear and the actual mount is messed up and you are sunk into it a little bit. But the good news is, in 3.1 it is fixed! If requests, ill try to redo this edit for anyone interested in it when 3.1 comes out.