In the process of having the hatch repaired I had to remove the panel that covers the base of the hatch. See here and take note of the 4 5mm nylon trim plugs. Left two shown in this photo.
Untitled by Victor M, on Flickr
The 5mm trim plugs go into black grommets that break easily and are no longer available. I found a replacement option that with a small modification work well. In this phot you can see the stock grommets and the replacements I found.
Untitled by Victor M, on Flickr
The modification is simply drilling the hole out with a 3/16 drill bit. They plug right into the factor hole and the 5mm plugs slide right in. Here is the packaging of the ones I sourced.
Untitled by Victor M, on Flickr