Here's a pic for you. hope it helps.
The two little covers go on the top and screw in from the under side, to cover the little vents. And the big cover goes on the underside of the large front-centre vent, where the mesh is held on with 3 screws, you take the mesh out put the cover on, then the mesh back and it's all sealed.
*siddr20 -- it cost me close to 2K, but hey, it matches the boot.