i dont think you really need the clips, just use 3M double sided tape.
I remember reading a post about someone using one of those paper binder clips as a clip... not sure how well it works though. It think it would start to rust and eventually break.
well with the cf hatch i need the clip to make it stay on. ask any one with a cf hatch the ends bow down a bit more than a stock hatch and the wing doesn't fit the curvature very well