Nevermind found this on the web.
Bosses that drop level four elite clue scrolls are God Wars bosses and generals, the Chaos Elemental, Corporal Beast, Bork, Dagganoth kings, Kalphite Queen, King Black Dragon, Falador mole, and Skeletal Horror. Other monsters that drop elite level four clue scrolls are bronze dragons, iron dragons, steel dragons, and mithril dragons. Thanks to Jagex Mod Poppy for the confirmation of this list.