I never had such a bug with the Zeppelin parts ...

If you fly to the left, facing the Barrack where the 2 Black Ring merchants (Abram & Beird) are,
it that "corridor" you can spot at least 2 different Zeppelin parts (search there in all Wyvern nests) and a third kind of part you can find in the Tree on that island where you can kill Charly, the Goblin with his two Axes (or Scimitars?) laugh

All the luck for all of you .
Hope you enjoy like I do !
smile

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !