The parts can be drops or odd gears and gnomish tinkered-looking stuff around the landscape. They tend to be found along the base of constructed walls and are hard to spot in low-rez or when too far in 3rd person. You need 8 pieces. The harvestable gears will refresh, given enough time.
Reported harvest locations include:
1386, 406, 755 - right by the opening next to the animal pen in U.J.L. 1.0
Find a scroll in a cell, near Hoptor Thagglor at -244,-54,-130 . Although you will need to clear the rest of the room, you can get the update through the bars without actually fighting Hoptor.
"I did not find the Robes, but I did find a leather scroll signed by someone known as Rokyl."