This one does both:
http://www.z1auto.com/prodmore.asp?model=350z&cat=engine&prodid=1358
Or if thats a bit to pricey (it is for me) then why not make one yourself?
http://www.350z-tech.com/zwiki/Build_your_own_Oil_Catch_Can
I got a universal one on ebay one but not on the breather side think I'll get that sorted though since I suspect more going in from that breather hose...