Ah, your looking at the white one and not the other ones. The first link no worky for me, so I just went to the main site and figured the question was about the bike on the main page

So yes, the bike in question does have a tail off a RS125.

Either way you will need to either modify the NSR subframe a good amount, or create a new one from scratch (based on the 125 subframe).

I checked out what it would take to use the RS250 tail on my MC28. Wouldnt take that much, but would take some modification.
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Charles Gallant