Okay, I did a little hunting. The Pantara is kinda cool. It looks a bit like a Windjammer knockoff (as many of them were). It is British made.
I could not find a source for replacement screens, however, you might want to contact this guy. He provide replacements for Wixom, Lufmeister, and some others. He might be able to help you or point you to a source.
Industry leader in aftermarket and custom motorcycle windscreens. We will bring your windshield ideas to life!
bikescreen.com
Good luck!