Not farmiliar with them personally, but logic would dictate that they use a standard automotive wiper..... albiet, probably a short one. I'd pull the arm and bring it to a good auto parts store. And i don't mean an AutoZone type of place where they can only punch your make, model,year, engine size, etc. into the computer !!
Worst case scenario..... unless i'm mistaken, Curtis is right in Worcester,Ma. You could always call them direct and pay four times too much........