Used but in great shape fuel tank. 
Compatible with other models.  Check acerbis:
https://www.acerbis.com/eu/motorsport/plastics/fuel-tanks/oversized-fuel-tanks-/ktm/0023957
Please allow us to double check shipping outside Switzerland. It might be not possible. 
Oversized tank 15L / 4 Gallons
Ideal for both long and short distance competition.
Designed to maintain a narrow, ergonomic profile to ensure optimum rideability.
Clean lines that follow the original shape of the bike.
Possibility of Quick Fill cap mounting
Possibility of fitting cap with Acerbis key