I am trying to install an after market stereo on a 2007 Sorento LX and the installer says he could not complete it because the harness he brought does not fit and he called around and no one knows where he can get one. It's a Delco radio/CD player that comes stock with the Sorento. Apparently there is an amplifier that will not fit the harness. Any one out there have or had this problem and where can we get the parts? Help needed. Thank you.