pre-wired mic is, I believe, usually in the interior light -- so the one you have might have been moved for better pick up. The aerial isn't necessarily in the stubby -- it's inside the car usually -- again, I could be wrong -- but that's my take :-/
I"ll try and bluethooth some pics from phone to laptop and upload them later....the mic is rather large so guess its part of what ever previous car abuser (owner) has had fitted.
Just been looking up the bluethooth kit The boy mentioned and must say it does look good,be interested if anyone has had dealing with this kit.
I use the CK-7W in both my Omegas (and in her Rover), with sound redirected through stereo via autoleads adapter.
Works well, although the one in the tractor is faulty (I have a spare sat on my stairs, just need to fit), giving the other party an awful echo.
To use voice dialling, your phone has to support voice dialling over bluetooth - most Nokias do, 2/3yr old Motorola (Razer) and SE seem to be a bit flakey, and most pre WM5 Windows phones don't. HP Windows phones seem problematic with either voicedialling, or TomTom using the bluetooth permenently.
With my Nokias, and my current Windows phone, it works flawlessly - I jump in car, start car, and any incoming/outgoing call routed via stereo. Both mine and Mrs TBs phones are set up for all 3 cars, so they both 'just work'. If we both get in car, its luck of the draw which one becomes handsfree - the CK-7W can only deal with 1 phone at a time (can have up to 8 paired), though if there is more than one of us in car, I prefer her to take call anyway.