In another thread, this catch can was recommended:
AdminTuning Coolant Overflow Oil Catch Can 370Z G37 VQ37VHR G35 350Z VQ35HR However, it is a single can for both lines, and pretty large and problematic for placement once the front of the engine compartment is packed with the s/c unit and belts and pulleys. I'm sure the guy who builds these could custom-fit it to be placed anywhere, but it's still a single can.
I think most folks go with two of these:
https://www.z1motorsports.com/forced...n-p-11657.html You can fit them anywhere there's room.
Another brand I've heard thrown around on these forums is Saikou Michi. This is an interesting post by a member who built a catch can out of an aluminum water bottle:
Coolest Oil Catch Can
If you plan on tracking the car, it's important to note that the vented catch cans are not allowed on raceways because of the potential for oil to be thrown onto the pavement. Some catch cans have drain plugs in the bottom, but, IMO, it's just another possible source for leaks. Easy enough to unscrew the can and clean every once in a while.