When I measure the windscreen from the top of the screen to the bottom opening of the screen, just above the the cowling, along the centerline, I get the following measurements: stock screen=11"; Zero Gravity Sport Touring=17".
Based on the Zero Gravity website, the Sport Touring is 4" taller than their SR. Some quick math concludes that the SR would be 2" taller than the stock screen.
I hope this info helps. BTW, the installation of the Zero Gravity was very easy and took all of about three minutes.