I tell you guys, if I'm a lying I'm a dying, you don't want to cut the 009-311 if used on Hehr "Hallmark 12's", p/n C12XX windows like in the image Wayne sent. Here is a scan of piece I went and got from the garage. It is exactly the same as the original in the image. Those ridges are there for a purpose and lock the strip and pane onto place. RJ