check out the Targa set up. It has the best fitment for the 250 that i know of with mounts for the turn signals.
I got a cheap one for $40 or $50 back when i have my 250 and it fit like crap.
http://www.amazon.com/Targa-Fender-E.../dp/B002F8BSN8
https://www.ninjette.org/forums/showthread.php?t=107661
I dont know about the MD one for the 250 but the one they make for the 300 was awesome. for that i went with the integrated taillight they make.