This has been discussed before, but parts availability has changed.

I'm looking at getting a cellular hands-free kit (specifically, Motorola
IHF1000).  It comes in two varieties: with its own speaker, and using
the car's speakers.  The version that uses the car speakers requires a
mute input.

In the past, Saab made some sort of a hands free kit, (P/N 02 48 666),
but my local dealer wasn't aware of it.

My service manual refers to a wiring loom in the passenger footwell, and
elsewhere to a cell phone mute input (which may be active-high or
active-low; not clear) but doesn't explain much.

1.  Is there any value to spend lots of time tracking down the elusive
Saab kit?

2.  Does anyone have documentation on the factory-installed harness?  Is
the mute pin active-high or active-low?