How do I reattach trim piece behind 3rd row?

[cheapdad00]

Not sure what it is called, but it is the trim piece that covers up the gap when the 3rd row is folded into the floor and then flexes up when the seats are in the upright position. The "rivets" holding mine in place have released so I have to manually guide it into place when changing position of 3rd row seats. Any ideas the best way to fix this? Thanks in advance for your help.

 

[GAINMOB]

I think u would have to completely take it out and buy a rivet gun and fix or just simply replace the entire thing