Does the job

I have this attached to my mobile rack case, it holds my headphones so they're out harms way and easy to find. It folds back out of the way when I want to put the doors back on my case. It's sturdy and convenient.

It's not symmetrical, the screw holes are skewed to one side slightly. This doesn't make any difference to me, it might to you.

I have one minor gripe. One of the screw holes is partially blocked by the top of the holder arm, it can be a bit of a pain accessing and tightening the rack screw. Of course, once the holder is installed, this is not an issue at all.