Cables are problematic since you have to start with the iPhone lightning to Camera adapter that only comes in one flavor - Apple Vanilla. Your only option is if you buy the one with a charger port or not on the Camera Adapter. The Dragonfly USB A plugs into it directly and the Analog Output from the Dragonfly is a 3.5mm on both ends - For my truck. I believe you can also get a 3.5 to USB if USB is the only available input to your system. The Sync 2 has both but I think the Sync 3 only has USB.
Since it is a factory system, I used a slightly better 3.5mm than the $7 one but I am not going to spend more that 50 bucks on a 6 inch cable into a mediocre sound system.

