Andy wrote:This is pure speculation, but it is a possibility; you'd need to do some research though...

HRC NF5 rear shock

There is a possibility that the "fork" bottom on an NF5 shock could be swapped for the NSR SP's "eye" type bottom. Naturally the shock will need to refilled/re-gassed after, but I'd imagine you'd want it rebuilt before using anyway.

You'll have to ask someone nicely how long an NF5 shock is and compare that to the length of the MC21 shock, but it's something I've thought about for some time now. NF5 shocks seem to go for very reasonable money, and if it does work, "converting" them NSR spec could be the way to go!

This one's £75, and even if you spent £150 on it having it modified, rebuilt and re-sprung, that's still a cheap HRC shock!