try to figure out how to read in displayinfo from WOD but thats little bit .... ffs i have no idea how ...
In WoD, Only items that use entries from the ItemDisplayInfo.dbc are files that use an M2 or BLP such as weapons, armor, cape. All other items such as Non-Equips, bags, Rings, Trinkets, Necks, etc that don't add any Visuals to your character have their Icons referenced from the Item.db2 > FileData.dbc
This is why WoD's ItemDisplayInfo.dbc is smaller than MoP's dbc file.