Again, my car has the Bose system so I needed the RCA to fiber adapter (NAV TV), if you don't have Bose, you can skip the $600+ adapter and just use a wiring harness adapter... The NAV Kit 210 is available from a lot of sources. I went straight to the manufacturer in Florida NAVTV.com and ordered MOST HUR 997 KIT-210. I called and talked it through with them - very helpful, showed up in a few days. As for the head unit - I ordered it through Crutchfield and told them it was a non-bose car. This gave me the bezel and wiring harness for free. Most of the wiring harness doesn't get used (only power, ground, and antenna power), but it kept me from chopping the car harness in case I ever wanted to go back. I sat down with all of the wires and manuals and drew up a schematic ahead of time, then soldered and shrunk all the wires.
You will need to order a fuse tap as well to get the switched power to the head unit - the stock system pulls it from some source that doesn't get hooked back up.
Making it even more fun, the MOST adapter needs the key to be in the run position to be on for more than 15 seconds. I racked my brain for an hour on this one and was ready to return the unit until I called tech support...