My '85 Mercedes wagon has cruciform vent louvers that are too thick where they meet in the center to hold the phone mounts I’ve seen that purport to be designed for such vents (like the one you have pictured here appears to be), and they’re situated in round cavities so deeply inset in the dashboard as to foil any other vent-clamp style mounts I’ve tried (again, including the one pictured above). I’ve had the best success with a CD-slot mounting phone grabber, something akin to this. It works with or without the removable face-plate on my car radio, allows the phone to be rotated any which way and stay put.
Anyway, I s’pose it might be useful for the dwindling subset of people with ornery vents and CD-slots in their car radios.
