just went through this last week for my 5. I bought this: http://www.dexim.net/us/products/car/DCU086.html
for $15 from my local shop. I removed the suction cup and epoxied in an thin angle bracket I had lying around the house. It now mounts in the credit card holder on the dash and clears all the radio buttons, and can pick up a GPS signal.


. I purchased software back in the 3GS days and it has carried forward to my new phone.
