Ford E-series Window Louvers

Got my louvers in and first thought was they were pretty flimsy, but oh well they're hard to find. Followed instructions to a T and went to install but the louvers wanted to install over the window gasket, not direct to window. Because of that the adhesive tape couldn't make contact with the window. I called Willpak and they told me these ARE MEANT TO BE INSTALLED WHEN WINDOW IS INSTALLED UNDERNEATH WINDOW GASKET. I told them there was no mention of that and the guy essentially told me that it's not in the instructions but should be. So I spent $100 bucks on flimsy louvers that don't fit correctly and don't install correctly. I ended up hand trimming both with a utility knife so they fit the window. They're not perfect but they look pretty good now. I definitely wish I'd have known this first. If you're looking for an easy install window louver, these aren't it.