I didn't use the leading edge pieces. only the static flaps. I would not use the leading edge pieces even though they would easily fit, they are designed for a flat bottom wing so results may not be the same. I may try them to see what happens. Here is a photo of the speed brakes. I used a few drops of ca to mount them so I can easily snap them off when I want to remove them. (Note! this is photo of the speed brakes attached on a Next Star trainer)