Mopar part number 82209617AD, allows you to use aux/old ipod connection with the factory 6 disc changers (RAQ head unit)... Taken from my 07 ram laramie with the 6 disc changer before I sold the truck.

They were an expensive part when they were new, but due to it using the old apple plug (can be used with adapter I believe) I'm only looking to get $40 plus shipping from sask canada. It has 2 inputs, one is the old 30 pin ipod/iphone plug, and the other is the standard 3.5mm aux in plug. If using the ipod/iphone in, the unit allows for full control of the ipod from the steering wheel controls and stereo head unit.

https://www.moparpartsgiant.com/parts/mopar-module-ipod-interface~82209617ad.html