Dial? Not sure which part you're referring to.
The only part common to both the X-Wing and TIE chestboxes is the male half of a snap (as used for clothing).
Many folks use RC car gears for the side thingies...although I think finding one with the correct number of teeth is tough. RC gears I've seen (and used) have more teeth than the screenused gears. (I forget the correct number of teeth, though.)