As an E53 owner ourselves we made the phone mount base that didn't exist for this platform.
FDM's X5 Cell phone dash mount is designed to work in tandem with the Scosche MP2AMPSPC Magic Mount Pro2, which we found in our testing to be the best magnetic mount on the market, Strong Neodymium magnet hold and compatible with Mag Safe cases or any smartphone with magnetic charging built in.
Our dash mount pressure fits under dash trim and is secured via 3M VHB double sided tape for secure and long lasting performance. Positioning is extremely solid and does not sag or flop. Charging cord is conveniently routed cleanly up from passenger footwell charging port and attaches to built in clip on back of Magic Mount so it is always at hand. For more info and to order the Scosche Magic Mount Pro2 go to: MagicMount 2 Pro AMPS
