Casette audio pins on Delco 16080121 stereo
 

Hi, all. I wanted to hard wire in an auxiliary cord to the factory Delco 16080121 stereo that came in my '91 Caprice but I can't seem to find where the audio pins from the cassette heads are. I've looked online, but nobody else seems to be doing the same. I very willingly would use the cassette player, but it is broken, so I thought to just bypass it. Thanks.