I got a Slipstreamer windscreen for my GT300 and am very pleased. I think it was an "XX 66" on Slipstreamers site. I can look over it easily and see the road about 50-60' in front. Very reasonable in cost also ( about $75) as I remember. It does have a headlight cut out on the bottom edge, but that's fine, and I noticed the screen offered on Kymcos site (Puig?) also has the cut out. I've ridden the scooter up to 80mph and no flexing.
Karlu
Las cruces, nm