I ordered the Frd-03-aux/s, the one with the 16 and 24 pin connectors. The guy sent me the "xm commander" version which has a 5 volt output to connect an XM device. It works fine though. My stereo had 16 and 24 pin connectors, although the 16 pin was unoccupied. This is a 2006 xlt with 6 disc in dash changer and 7 speaker audio system. I scratched up my dash taking out the radio, but that is for another thread.
No problems with it at all. My sources so far have been Pandora and mp3s both from my cell phone. Before I did this, I was going to get a new head unit and an additional satellite radio + subscription. This was a much cheaper option.