Hey Jim!!!!
Garmin cables do not necessarily have the other wires in them...
One time I cut into a 296 power cord thinking I was going to find the speaker output wires in there and they were not there!!! I ended up splicing the cable back together!
That being said, to get bare wires for the Aera, all you need is this cable:
Aircraft Spruce #
11-08088
No reason to wait 6 weeks! Your local ACS states they have em in stock...
I bought one and it works great as I have my Aera installed and working in my panel....
Almost done with Phase I. Thanks for the motivation when I was out there!