FWIW, I had a 2004 TL w/ dvd based nav as well, but it had a PCMCIA card below the drive in the trunk. I tried using an 8GB CF + CF PCMCIA adapter, and it didn't work. Perhaps a true PCMCIA drive would have worked.
I posted some info about the CCC a while back, here is the thread:
http://www.e90post.com/forums/showthread.php?t=526586