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From: HOW FAST WAS I GOING OFFICER? Los Angeles Hating GM Dealership Service Dept.'s Since Sept. 2004
St. Jude Donor '04-'05-'06-'07
There are four tabs (2 in the left, 2 on the right)
You can take a large, flat screw driver (cover it with a towel) and press the tab. Pull the nearest corresponding corner of plastic frame away from the car. You don't have to press too hard.
I use my index finger and push it it with the opposite hand. The frame's corner pops off, I go to the next one.
Never worry about asking questions ... we're all here to learn.