My car's air vents have horizontal louvers and vertical louvers behind the horizontal louvers. The gaps between the vertical bars were too narrow for the hook piece to fit between. So I had to file down part of the hook to make it narrow enough to fit between the vertical slats. Just enough for the hook to snag on the horizontal bars. Also, it works fine once I set it. I didn't hook the vertical bars. The hook part didn't reach far enough.
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