"AWS molded these with a tiny ridge on the inside that fits exactly in a shallow groove in the window trim on our truck. The result is that when you install the vent shade, the ridge-groove fit serves as an exact index for alignment. You would have to make a real effort to get them crooked! The front shades also have a tab that slips under a trim feature to keep them snug. When all is said and done, these do a great job and look good."
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