I did the same thing as the above, where the stock PCV broke clean. i think my Stillen G3 intake may have had something to do with it, but I cannot be sure.
I used the above posted part from Autozone
Motormite/PCV Valve Elbow (47032) | AutoZone.com
and it's worked for about 20k miles. No special order, just go there and grab one off their shelf.
Also note, the stock piece is really not a traditional PCV. Usually these pieces come with some kind of one-way check valve, but thats not the case with the stock 370z unit. Honestly I dont know why Nissan made the piece so complex for what it does internally; which just naturally connects both inlet/outlet without restriction - a straight through (plus angle) shot in and out. The 90' bend from Autozone does the same thing just fine.