I have a snap in adapter for the Iphone4
Never used due to my E13tron case not fitting in the adapter.
It is Part # 51472154481* Normal price 121.00
Phone version (requires base plate) snap-in adapters provide:
•Charging of the device
•Secure and stable docking location
•Vehicle specific mount
•Improved reception by connecting to the vehicles external antenna
Would let it go for 75 bucks, shipping included