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2018 Terrain Denali 2.0T FWD
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I don't really want to tear my cargo area apart in my '18 Terrain for a "just because" situation, for fear of introducing a currently non-existant rattle. But...

I did remove the cargo floor and cheapo tray above the spare tire. Using a light I peered through any openings in the plastic well enclosure and didn't notice anything but painted surfaces. While looking around I did notice a narrow and deep depression in both of the corners of the well enclosure towards the end closest to the rear seats. Using a tape measure, the spacing of the two depressions appears to closely match the distance between the holes in the piece your photo. I didn't crawl into the vehicle to peer down the two depressions to see if there was any hardware (such as screws) at the bottom, but perhaps this gives you some clue where it would go. Just a WAG.
 
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