I'm looking for a bluetooth module to install into my 2000 GS300, but it has the older style radio wiring harness which makes products like the GROM not compatible.

I came across the Parrot MKi9000 and it looks like it just interrupts the line out from the head unit during bluetooth phone calls or music playback.

http://www.parrot.com/catalog/products/parrot-mki9000/

Has anyone else used this? The compatibility page says its compatible with the older style plugs on the head unit (you need to select 1999 from the year dropdown, 2000 is grouped in the newer category) but they don't actually tell me where to get the wiring harness from. They just say "see an installer" but I'd rather do the installation myself.