Extra thick Andersen screen frames
Hello,
It looks like you have an older Andersen screen corner which, unfortunately, is no longer used. Andersen has changed the profile of the screen frame and it now takes the narrower corner key. I suggest trying a hardware store in your area that might have saved some of the older corners like your original. The only alternative would be to order a new complete screen to fit your window and save your parts for other repairs. We have tried in the past to match up this corner, but have not found a substitute. If you'd like to send back the corners you already purchased, our return policy can be found here. I'm sorry that we won't be able to offer more assistance with this repair but please let us know if you have any other hardware questions. Thanks for posting.