I have iPhone 3GS proclip docks with integrated cable.
When I got my iPhone 5, I pushed the Apple 30pin to lighting connector onto the Proclip dock. The iPhone 5 worked, but wobbled unless I stuffed kleenex behind it. And when undocking I had to use 2 hands or the lightning adapter came off the dock.
I like the ideas people came up with here to add felt to the 3gs dock channels, and the idea to put the lightning adapter into the proclip dock down low, where the 30pin cable sits, so you dont need 2 hands to undock. otoh, by the time you buy the $30 lightning adapter, youre almost half way to the cost of a new dock.
I bought the new model 514422 iPhone 5 dock from Proclip. I dont use a case, and do not need the cigarette lighter charger, because my stereo accepts the USB cable from the iPhone.
this lets me hear navigation and music through my car stereo, and keeps the phone charged.
The Proclip iPhone 5 dock I chose is $50. Plus a lightning cable, another $20. It works great, no need to use 2 hands to undock, no wobbling of the phone when using it in the dock.
Other than price, I like the new iPhone 5 dock very much.
btw, the iPhone 5 headphone jack is on the bottom. IF you use an auxiliary cable to feed music from phone to stereo, you need the new Proclip dock that leaves a space for the headphone jack. The old docks cover the headphone jack on the iPhone 5.
So dock options include,
1. a dock with no built in cable (2 hands to connect and disconnect cable)
2. dock with integrated cable mount, that lets you plug into USB power, either from a cig lighter, or stereo.
3. If your stereo has no USB, you need a cig lighter USB charger, PLUS an auxiliary cable to send sound from phone to stereo. If your stereo has no headphone input, and no USB input, you can not play your music through the car speakers. fwiw, FM adapters work very very badly.