I've been scouring the internet and parts stores looking for what I now know to be a "crankcase net." Now the only problem is I can't find it anywhere. If anyone has a link or an alternative that would be great. Thanks. 

I'm pretty sure you can still buy em new from Nissan. Motorsports should have em too.

If it helps, the part number is 11037-E3000.

Here's what Motorsport has

http://www.thezstore.com/page/TZS/PROD/10-2895