Buying set gear with points/coins for a different class

Hey!

I wanna buy those items for a transmog set,on my PRIEST , but when i try to buy them....it says that "i cannot use those items" and failt to buy. I just wanna transmog those items. Is there a way how i can get those items on a different class than lock? I really love this set and wanna make my priest to look like this to be more "unique" lets say :)

http://wotlk.cavernoftime.com/item=46140
http://wotlk.cavernoftime.com/item=46136
http://wotlk.cavernoftime.com/item=46137

You can't use those items on any other class than warlock and they won't enable it.