I had zxr400 forks on mine before i came across rvf400 forks.

Definately sounds like the discs you have on there are still nsr.Measure them.

Using a combo of nsr and zxr400 spacers the wheel shoul fit ok.
You also need to space the calipers as the zxr yokes are slightly wider than the nsr yokes , i had some made up by a local engineering firm that slotted into the fork caliper holes.
Can't remember the exact measurements as i sold the forks.

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