
I set out to install a screen with small openings so the smallest mouse (accidental pets

the pet doors are located behind the rear bumper end caps
the openings are about 0.5 x 0.75 inch
i chose to use metal screen with fine grids - can be found at hardware stores
i cut the screen to (a bit smaller than) the outline of the port assembly with 4 rectangle tabs
i glue the 4 tabs to the slots with auto body filler - and they are ready to be reinstalled back onto the vehicle
I used auto body filler as I can remove them in a later day if necessary. Epoxy would work just as well. Do be carefull not to fill the slots it too much epoxy to interfere with the plastic locking cams.
Please do note that to remove the end caps of the rear bumper, you must remove them together with the main bumper fascia. Otherwise you risk breaking the plastic interlocking tabs that connected them together.