I give you a german view:
Yes, you can ask the factory.
The technical department or porsche classic..via e-mail or phone.
It takes time, but you get an answer.
But they look in the archives, there is only a small amount of people, who really knows the old cars (maybe at porsche classic).
After 20 or 30 years?? normal...most of the important guys are dead or no longer working for the company.
There are a lot more customers with all the new cars.
They hold an big amount of original parts in stock, but maybe they can not produce it again.
I think there is no way to produce an old chassis, if its not on stock.
The old machines are no longer available and a lot were handcrafted.
All rare parts..getting expensive..
To keep all that stuff in stock over 50 years is really expensive.
A new 3.2 engine from stock is maybe available but around 48K, a new 996 engine is 10K.
That shows the difference. Original Targa top up to 13K..etc..
But how much people bought a 3.2 engine over the last years??
If important parts ran out of stock, they search for other producers.
Example 930 fenders...long time expensive around 1500, then unavailable. Now only 800. Not everything gets more worse.
Only mercedes has such an amount of stuff for old cars available.
10 years is a normal time for all other companies to stop producing spare parts for old cars.
My opinion is:
the knowledge of some small independent porsche technicians and a big community (like pelican) is (after 30 years working only on the old cars) maybe much higher than the one some old porsche engineers.
Thats normal and i appreciate that.
And Porsche still do changes on parts.
One or two years ago, there was a recall action (free of charge) for 993 cabs.
They changed the electrical convertible top motors for free(around 1000 bucks), after 10 years. Pretty okay.
There is a new version out for this motor...and it fits also into 3.2 or 964.
This was an security issue- a fan is different
I think its impossible to want more and i totally agree that porsche now is a normal big car manufacturer...since 1998
Jo