I've done the swap several times.
The adapter kit from Chrysler is about $15 and will include the PCI communications bus wire that you are concerned about.
Be sure to get the correct kit.
One way goes from 2001 radio into newer PTs and the other takes a newer radio into a 2001 harness. The connector gender is reveresed.
Look at the power antenna guide at
www.ptdiy.net for all your answers and photos.