I was told that you can get "your" key code from Porsche Classic - just tell them your VIN and get a complete set of keys from them
of course you have to proove that you're the legal owner of the car, and
of course it's not cheap, and
of course they can only provide the original keys (like delivered)
so, you should only do this, if you're absolutely sure that your keys/locks are still the original ones ...
and this is exactly what I ordered for my six
I'm still waiting to get the set - and I'm still curious if it will fit