I've been told that CBR900RR will work, I ended up reusing mine but bought a filter screen from CBR900 and cut it down, just the bottom to match the length below the shoulder I think it was about $27 and came with 2 rubber rings, one that seals the tap to the tank, another that goes on the end of the brass tube.

To clean the tank I used this stuff:



before



and after



Pictures are of VF1000R tank, not NSR which was in much better shape.

I bought a 5 gallon bucket of this stuff (first pic) called "Metal Rescue" for about $100 shipped and have done couple tanks already, have few more old bikes, hope I can get at least 2 more tanks before it looses it's "juice"

It should work in 12-24 hours if temp is above 75F but here in winter it never got above 60F indoors so took a week, I was not in a hurry. I soaked the fuel tap in it as well, it seems to work well now