Left Arm: Found near the entrance of The Scar.
Right Arm: Go to The Shadow Gorge(fast travel to The Shattered Forge). Run to the "W" on the map in the word Shadow.
Left Leg: Travel to Baneswood. Make your way towards The Charred Pass. You will find this after the archway, a little before the second "S" in "pass".
Right Leg: Fast travel to The Fjord and run East. You will find this in the South indention in the map.