Tier 2 source

Can pass links as parameters in the order of raid progression: onyxia -> rag -> BWL bosses.
Tier 2 set pieces drop from Onyxia, Ragnaros and bosses in Blackwing Lair. The set pieces drop from the following bosses:
* Helms from 
* Pants from 
* Bracers from 
* Belts from 
* Boots from 
* Gloves drop , & 
* Shoulders drop 
* Chestpieces drop