I've used both of these to good effect in the past. But needed to purchase new items having sold old items.
Headrest mount: http://www.cameragrip.co.uk/acatalog/ha ... mount.html
iPhone mount: http://www.cameragrip.co.uk/acatalog/ha ... mount.html
I got the iPhone 5/5S model of the phone mount. I prefer this interior view offered from the headrest position, and as my car (M135i) doesn't have bucket seat, works to great effect.