I bought this clutch line. http://cgi.ebay.com/ebaymotors/95-99...QQcmdZViewItem The smaller fitting goes into the slave cylinder. Now where in the hell does that big fitting go into? There are threads on the inside of it. Can someone offer me some insight?

It connects to the hard line on the frame.

check this out here...
http://forums.maxima.org/showthread.php?t=495119&page=4
it's where I got mine from.
pictures are on that page about 1/2 way down.
jsmax
hope that helps you out.

Yes it completley answered my question....except I need one now. Hah.

Looks exactly like a brake line. wonder if its the same connections. If so then I got 4 of them to sell.

I ordered mine from a33vq30 on here. He ran a sale for 25 shipped in the us. he only made 20 of them and the line is a technafit brand. The price you found on e-bay seems fair. I haven't gotten around to installing mine yet as the weather has been way too horrible.
Should firm up the clutch pedal a little and will def. stop any leaks comming from the soft rubber line.
and nismo, they are different fitting than the brake lines for our maxima.