I heard that there are two types of fixing mounts for the wind deflectors. Flat base for the stud screen and curved base for the easy up screen. The Simmonds deflectors are glass, and fit inside the sidescreens. Some perspex screens came with my car but I didn't fit them, and passed them on to someone on TM. If they interfere with opening the door, I don't think they will be worth the hassle.
If you get the screw length wrong it will crack the screen.....
