Box fan sliding window attachment

My box fans won't stay in my sliding window. The sliding door attachment was a great start, but the sliding windows I have need a smaller opening, and are not as deep.

I also added a bit more clearance for the fan clip, because I think my lasko is newer and has a bulkier frame.

You can see the gap in the between the window and the fan using the yellow attachment, while the red and black ones are snug.

my sliding window has a smaller frame than the sliding door attachment