Hi Paul,
I used to use the RE hubs on the origonal car sometimes on very high grip tracks, but backwards to reduce toe-in. On the Worlds they arn't needed as there is plenty of weight on the rear wheels and plenty of drive. You can only get the RE hubs in the gold colour, if you want blue ones you need either Trinity or Rayspeed hubs. The standard plastic hubs are best IMO, less weight and less chance of snapping a ballstud.
The only spares you'll need are front wishbones and possibly the Losi steering blocks, other than that the car is indestructable
