Same question here. I 'think' they slid unto something.. maybe to keep the carpet flap on it?
Becareful when you put the seat back up, sometimes the bottom portion of the rear seat protector would get caught in the foam thing. I added a lot of industrial strength velcro everywhere just to make sure they keep still.
I got the cargo liner, courtesy of my dealer! They look great and yes, it does slide a little. Nothing that a few pieces of stick-on, hook side velcro can't fix. Also, those two tube things go between the longer and the seat, just slide it on. Pictures attached.
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