In Heroic Mode Slave Pens, the rare drops from bosses have been adjusted to level-70 quality. Those drops are provided below, by boss.

Mennu the Betrayer
Inv belt 25
Inv belt 30
Inv pants mail 05
Inv weapon shortblade 37
Spell nature protectionformnature
Inv misc noose 01

Rokmar the Crackler
Inv belt 15
Inv belt 23
Inv misc cape 13
Inv belt 15
Inv jewelry talisman 12
Inv boots chain 08

Inv jewelry ring 24
Inv mace 1h stratholme d 01
Inv chest plate08
Inv pants 14
Inv belt 26
Inv belt 13
Inv shoulder 22
Inv shoulder 20
Inv sword 27
Inv misc gem pearl 01
Inv bracer 08
Inv offhand outlandraid 03orange
Inv elemental primal nether2020