Okay, I got your payment. Also I spoke with my friend and have the info you need. Too mount the manual belts you use your stock bolts for the bottom and longer bolts that I'll get you for the top.
You also need a small bracket. I'll include a tracing of it and you could easily make it with some sheet metal and a pair of sheers for metal cutting. I got my sheers for $13. Great tool to have. Sheet metal you can purchase in small 4 in. by 10 in. sheets at a local hardware store. If you want I can buy them and cut the pieces you need and just charge you the price of the sheet metal.
I have an open diff which I can get welded as well. I'd sell the diff for $50 and then tack on however much the welding will cost.
hit up mel@performance. He has two great exhaust for sale. He can get you great pricing on nismo stuff too.