Prerequisites for the 9-5:
You need a 9-5 with the Saab audio system, AS1, AS2, or AS3. The audio systems have inputs for telephone audio and an input for mute signal.
The 9-5 must have one of the telephone preparation factory options. One option, TEL0, is a connector behind the ACC panel providing power for the phone and connections to the audio system. The TEL1 option also provides a microphone, mounted in the panel by the rear view mirror, and a antenna cable.
Prerequisites for the phone:
The phone must have a handsfree kit, i.e. some holder and electronics box with inputs for 12V and outputs for speakers. An antenna connector is needed to use an external antenna. Not all phones provide such a connector.
What you need:
You need a cable assembly from Saab that runs between the connector behind the ACC panel and your phone handsfree electronics. This cable assembly has been available in different versions, e.g. prewired for Ericsson phone handsfree (with connectors that just plugs into the Ericsson box) or universal (with loose cable ends).
An antenna if you need and external antenna.