You need one of these.

BLAUPUNKT WIRE HARNESS - NEW !!!! - eBay (item 110494716224 end time Feb-21-10 10:41:08 PST)

You're gonna have to solder in the new one based on the pin locations and wiring diagram from the service manual and not what is written on the new harness because it may be close or even dead on but if it's not, you'll be redoing it so do it right the first time.

Good luck