Isnt the OTR/Tourtech one simply a Polisport Universal Airflow fender..ie
http://www.polisport.com/motorbikes/produtos.php?ID=552

I chose the Airflow Motard one as I didnt want to block the radiator and my first YZF fender was huuuugggge!! Basically drill, flip the towhook and fit.
Matt.