I don't have links but quests you could look at are the ones for King Yormax's head, Dain's head or Yelinak's head depending on the item you want. The tear quests from Dozekar drops and Halls of Testing. Also, there is the quests from Veeshan's Peak. I seem to remember not all of them could be completed but that might have changed with the release of Yekesha. I seem to remember that the quests from Xygoz and Hoshkar were at least complete-able and then the Phara Dar one was once you get access to Tactics. I also think the item from Tactics is dropable if you find someone wanting to help you out. Don't forget about the earring quest line that ends with LiS. It goes pretty quick.
I know a friend completed the Spirit Wracked Cord which involved Droga. Not sure if these were the suggestions you were looking for or if they are too high level and you were looking for stuff closer to level 55.