According to the diagram, http://www.courtesyparts.com/images/l32/l32_963-1.gif
it looks like it is either done with sticky tape or perhaps some clips. Unfortunately, the diagram isn't that detailed...
You may want to call your dealer to see if they can do it, and for how much, or ask them how it is assembled.
Good luck and keep us updated. Your experience may eventually help another member who may run into this problem some day.