Zoom zoomin'

Greetings all! I am new to this web group but have been enjoying my 3 since Jan of this year. I bought mine used and noticed that the package shelf in the back that covers your items when the hatch is closed is missing. I can't find this item anywhere but at the dealership for one arm and half a leg!! Can any of you guys help me out? I carry sensitive materials for my work and don't want to display them. Thanks!!