Adding Bluetooth puck cradle to '06 R230




I understand that adding the phone may be somewhat expensive however I remember seeing a few years ago a detailed DIY with pictures and part numbers. Anybody knows what would be the required part numbers? I know that the car may have the PSE unit already, it is a '06 model. Is it just a harness and a cradle? Maybe there is a technical bulletin with the upgrade.
Thank you,
Radu


