These drop off of the Undead Caretaker. The legs come off Undead Jailor, the Gauntlets come off Skeletal Scryer, the helm off of sentry of Sathir. BP and wrists i dont remember...they are all undead mobs that drop them, and JS is usually the crappy replacement for the really good item they drop (ex. JS gaunts instead of DW gaunts from scryer)
Not True. The Jarsath legs drop off the Undead Jailor, ONLY. They are one of the only 2 good pieces of "Jarcrap." The Bracer at AC8 and wis4 is also nice, and fairly common. Better than a RMB.
By the time you could get these arms, you should already have much better. Even crafted is better for a warrior and easy to get pre lvl 30.
Shaman armor. Since shammies are chain class, they don't get as good ac items. Plus, iksar are limited even more by race. So, for my iksar shaman, these would be very nice. Also, hanging around in KC for them to drop beats some of the armor quests.