The best way to farm these is to shroud down to level 50, get the Fibble 5 instance, unshroud, and go plow a bunch of creep reapers. They can all drop these and other AAAA parts. There are plenty of reapers, they respawn, and there's no competition for camping since it's an instance. The only tricky thing is getting to the point where you can request that mission.
Only got told tonight, been selling them to merchants in PoK as vendor trash...guess I won't be doing that anymore. Boy, do I feel stoopid. Had at least 30 so far.