I got some adapter plug/harnesses for the white power plug years ago from VW, I'll check and see if I still have any or at least if I can find a part number.
As for the DIN plug, you can get a harness from Porsche and possibly even Pelican
part # 911.642.209.01
Adapter cable for Blaupunkt sound system for Porsche Classic radio navigation system with TCM - Porsche Classic
and here's a diagram of the DIN plug
