...it was simple to install, and works great! It only cost about $100 off eBay, and will mute the radio when calls are placed/received, as well as provide the sound via the car's speakers. Mine was the Motorola HF850 kit which only pairs one phone, but for another $100 or so, you can get the iHF1000 which pairs up more than one device.

Here is the control button...


Here is where I mounted the microphone...


Here is the control box mounted under the dash...


Here is the wiring harness I needed to connect the control box speakers and mute wire to the back of the radio. Wire from the speaker of the kit was simply cut and spliced into the (+) and (-) wires for the connector block. It did not matter which speaker wire was spliced to which wire to the radio. Note the Mute wire has a twist connector, but no wire connected yet (this is attached to the Mute wire from the kit's wire harness)...


Part numbers are:
357 035 447B (10-pin connector block)
000 979 133 (wire connectors, you'll need 3 of these)

Here are the connections to be made (wiring)...


You could try to retrofit the Motorola kit's microphone to the OEM location under the dome lamp panel, but I've done that in the past with limited sucess.