The VFR and RVF arms are different enough to make it a pain in the arse of a job. As racer38 says, do yourself a favour and get an MC28 swingarm!
There are loads of posts covering ProArm downgrades for the MC18 and MC21, and people have already given sound advice. Use the search!
Duncanb has posts all about it in his build thread. The £10 it will cost to be a member will be saved just in time alone reading some of the extra information available to members.
Too late for you now, but buying an NC30 or NC35 swingarm for an NSR conversion is a false economy.
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