Not sure of the exact application for these original Ford stereo speaker wiring harnesses. We think that they may have come from the radio kits installed by Ford and Mercury dealers. Note the special speaker connector plugs. The individual right and left speaker wiring leads are about 40 inches in length from the center plug that goes to the radio or stereo. The paper tags are missing from these harnesses, but we are pretty sure that they begin with C8OA-19A041.
One of our customers says that it fit his AM-8 Track installed stereo radio. It typically does not fit factory installed speaker connectors in a Mercury Cougar. We think that it was from a Ford stereo kit which could be bought from the various Ford and Mercury Dealers.