so now after 3 weeks of hunting hoverbombers 112/112 and/or 124/124 ones i got those parts.maybe the server restart fixed the spawn/loot or a GM who knows.

ha its easyer and faster to run this quest on another toon then get a "new" key.

anyway it seems those parts are droped in diffrent zones.
u have to kill all the "normal" hovermobs first, they are kinda like place holders for the hoverbombers.