[Flat Six]

A while back someone else had this same question:

https://forums.pelicanparts.com/porsche-911-technical-forum/614095-pcv-3-2-does-she-need-teminate-how.html

Dunno if this AutoZone valve is the right size, but looks close:

https://www.autozone.com/emission-control-and-exhaust/performance-pcv-valve/p/spectre-pcv-valve-for-breather/266133_0_0

If you get it, let us know if it works.