cat door (CUF)

I am in need of a cat door for my window like the one pictured up above. This is kind of an out there request but figured I would try. I would like one with the piece that fits the standard window, but I am willing to take one pictured up above. Hope someone can help me out. I can't keep my cats inside, I have tried, so having a cat door would really give me piece of mind that they can get in an out on their own and won't be stuck outside waiting for us.
Can you help with this request?
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