I don't think it will work for a couple of reasons:
From the ad:
For small round headllamps with diameter up to 5 3/4 "(14.5 cm)
The Monsters have about a 7" diameter headlight so the headlight "lens" on that fairing is smaller than your OEM headlight.
Important: Universal headlight fairing without mounting kit
How are you going to mount it and what are you going to mount it too?
Also, even if the headlight opening was big enough to fit around your headlight, look at how far the top of the fairing swoops back. It's probably going to interfere with your handlebars and/or master cylinders. I imagine the lower portion of the fairing might also hit the forks.