As mentioned in your thread in discussion I have what I presume is an mc18 r6k shock.
It's 29cm long, remote res, has kv3 (NSR part code) on the res and NSR mounts both ends.
Hence I keep saying measure your shock as it caused problems with the chain line on my bike but that bike was a proper bitsa.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread