Adding Bluetooth to Mercedes CLK

Hi, I would like to add Bluetooth handsfree to radio in my '02 CLK55 AMG. I would like to keep the stock head unit, or one from a similar model. I have the pre installed telephone wiring but the cradle, etc were removed long before I got the car. It originally came with a Audio 30 head unit but it currently has an Audio 10. Is there and adapter that I can use or possibly a Viseeo unit that would work?