I'm sorry that I can't tell you how to do this, but I can share some information I've seen over the years.
If you have a CDR 23, you face a significant challenge installing it in a 99 Boxster. Assuming the Australian and U.S. audio systems are similar, the CDR 23 is a MOST (fiber optic based) system and your 99 Boxster isn't. You would have to find a MOST amp and cables if you want this to work.
I think most people that have contemplated this project discover that there are better, less expensive and less labor intensive options available.
If you have a CDR 220, I think it can be done but you need to have the DSP amplifier and the cable that connects the head unit to the amp.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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