I found http://www.amazon.com/gp/product/B00JG30N4K
works in the Leaf so long as the phone is thin enough, an overly thick phone in a overly thick case will pop out of it.
I switched to http://www.amazon.com/gp/product/B00V2RK1XQ
for one phone but then had to switch back to the first one when I got a phone with a screen so large that this wouldn't open up enough to hold it.
So over the course of 3 phones and two cars I went for mount A, B, A and I liked A better in the long run.
For those that said they didn't like the mount on the vents in the Leaf I like it because I live far enough south that I'm running AC or vent 99% of the time and the cool or neutral air works for cooling off the phone. If you live somewhere north and run heat through the top vents all the time the phone might not like that but I'd just run it on the floor only, floor and windshield vents (defrost), or defrost only.
I find it works in the vents for me and the vent mounts are cheaper.