[DSPTurtle]

Hey, isn't "kaput" spelled with a "k"???
Anyway, I have an original Blaupunkt subwoofer if you are interested in that. Are you sure you want to go with the stock head unit? You can't charge an iPhone from it and it probably has a tape deck.
I tried to locate an original '86 unit and ended up going with a subtle Pioneer that plays my iTunes and charges the phone. Only about two bills also. Plus, I imagine your stock harness is already hacked to he11 so it's probably more work.
There is a guy in Canada that is selling period correct BP rear speakers in case you need them. He's on evil bay. Let me know if you need his name.
Good luck in your endeavor!!!