I have a 97 that still had the original 'flat' AOS in until I changed it a few months ago. It was sealed and not serviceable at all. I'm also pretty sure there was NO version of the 986 AOS that was serviceable.
What I think happened (pure speculation...) is that some cars (e.g the Cayenne) do have a replaceable AOS diaphragm, but Porsche stopped selling them individually (see
Porsche Cayenne Repairing the Air-Oil Separator | 2003-2008 | Pelican Parts DIY Maintenance Article) ... some 3rd parties started making and selling them on eBay, and incorrectly labeled them as compatible with the 986, thus creating this confusion.
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