The Metra harness they used is easy to find:
http://www.carstereoreveiw.com/Cars/stuff/Ford/contour.htm and
http://www.carstereoreveiw.com/Installation/images/harnesses/70-5512.jpg shows the Met 5512, which seeems to only plug into the square plug that leads to the external factory amp, and has bare wires on the other end to plug into the aftermarket radio.
The other harness is hard to figure out. I notice "AudioLink" makes a line level convertor (different part number though) to convert from speaker output levels to preamp levels. "Al" on my receipt probably is "AudioLink".
I do not see where they charged me for whichever harness they used to connect to the other plug (the wide one).
