Why does Grievous have Jabba's Skiff steering vanes on his head?

[JediTricks]

Perhaps I'm playing catch-up to you guys, but walking past my POTF2 Tatooine Skiff just now I noticed that its steering vanes on the back are a dead ringer for the things on either side of Grievous's head, and in the movie, Grievous's head vanes even move similar to the Skiff's. What's up with that, is it a specific reference, an odd design touch, or merely coincidental?

[Kidhuman]

Maybe the Jawas scavenged his remains and sold them to Jabba.

[JediTricks]

They used the enlarging ray to get them to the right size. Oh wait, that only happens in crappy new Transformers shows. ;)

[El Chuxter]

He has to turn his head sometimes. Duuuuuuuh.

[2-1B]

and he features a miniature Pote Snitkin to steer him.