My understanding is you don't need spec drawings at all. Make your own. Owning the M96 engine is all you need. Apparently;
Our porsche indy/specialist here regularly drop by my place to profile & machine parts off my manual mill so I can't imagine it as being that difficult using the basic engine measurements (which you already have). Hand written notes on a greasy piece of paper and off he goes.
All I know is his parts are all similar looking to those you posted. All for diff engines... he does it all himself mate, he's fun to watch also
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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