You're referring to the spoiler correct? If so you could probably pick up all three pieces for cheap in the parts trader.
If you're referring to the rear hatch cover (fabric-covered panel that lifts up when you open the hatch) they are no longer available brand-new so again the trader is your best bet.
If you're referring to the rear hatch cover (fabric-covered panel that lifts up when you open the hatch) they are no longer available brand-new so again the trader is your best bet.