| Hi again.
Sorry, but I have no idea what the "thingy" you describe can be...
I am almost certain that it is not a speaker though...
Maybe just a cover of some kind instead of the automatic windscreen wiper detector?
I would go for a normal handsfree kit for your mobile, either in a normal install with a separate speaker hidden under the dash, or maybe connected to your head unit as described in my DIY install.
Regards, Tore | 
