NF5 pre 91 are 41mm RWU, same as the NSR, and will fit in NSR triples, although they are very short.
NF5 92 are USD with calipers similar to the NSR.
NX5 93 on have a different caliper pitch.
If I recall correctly, NF5 USD forks will fit into RVF400 triples... but good luck finding a set of those too!

If it's forks only, see if you can find some data on ZXR400 triples or maybe if you're desperate, RGV triples! If they are the same size you can use those with an NSR sized stem. I've NSR's fitted with both those front-ends.
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Andy.
NSR-WORLD.COM
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Last edited by Andy on Wed Feb 18, 2009 4:51 pm; edited 1 time in total