Cant figure out part

Hello,

We did carry your corner key at one time but, unfortunately, it is no longer available. With that being said, take a look at the 95-218 shown below. This corner comes with a slide latch which should work like a stop to keep your screen in the window. The square face of your corner should measure 7/8" and the thickness should be 5/16". Thanks for posting.

Alternate image for 95-218

Alternate view of 95-218