Telephone install

Hi Gang, I have a 2000 B5 A4, my car has the factory prep and I just ordered the cell install kit. I know the kit is for the factory phone but I wanted to alter it to mount my v710 in the center consol.

My plan is to use a Bluetooth kit with a cradle for my phone so I can install an external antenna.

Does anyone know what Audi used for the factory antenna for the phone? I was thinking about the factory Audi bumper antenna.

Any experiences or advice with this install would be appreciated.