Allegedly, they are a supplemental add on for the tonneau cover to keep moisture out if you hose out the back. The plastic pieces are stick on and a special adhesive promoter must be applied when they are installed or they will all fall down!! I think Hummer released the extra stickum after they had complaints of falling flubber errrr, I mean rubber. 
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\'05 Slate Blue Sut w/ Magnusun, JBA headers, custom exhaust, 22\" MC2 RT5 wheels, Pioneer AVIC Z1 nav, Passport SRX, Vizualogic A1000 dual, bi xenons, fog xenons, dual optimas, and just gettin\' started!
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