I'm confused but it sounds like you do not have the CB option. Get that camera working!
I recently added an OEM brand new cassette player to my Aspy. When people comment on how new it looks I tell them that I've just upgraded from 8-track!
Previous to that I purchased an adapter cable from a British website which allowed me to play my MP3 player, and anything else with a headset plug, through my system. Worked great but I wanted to go for the Collector Vehicle status with my Aspy.
If you're still looking for a cassette player you could always post in the For Sale/Wanted forum.