How can I install a hands-free system in my Omega B MV6 Bj 98 ? The vehicle has a pre-equipment. Microphone is up in the lamp. In the footroom on the right I found the antenna connector. In the middle armrest is original an older Nokia phone, but without connection cable. I have not found a black box yet. I have already looked under the center console, behind the climate automatic. Maybe someone has a installation instruction for me. The phone should stay in the middle armrest I already got an original mobile phone holder for Nokia 6230i at Opel (130 Euro). But for the installation of the black box they want another 400 Euro. Maybe someone has a cheaper variant for me.