Ammys: Only on Uniques: Cats Eye, Highlords
Helms: Only on Uniques/Sets: StealSkull, Mavina's Helm, Andariel's Visage, Demonhorn's Edge(barb helm)
Armor: Only on Uniques: Twitch, Crow Caw
Gloves: Many different rares/magic/uniques/sets
Belt: Uniques: Goldwrap, Nosferatu's Coil.
Boots: Sigon's boots with Gloves.
IAS can only be found on rare and magical Weapons/Gloves... nowhere else.