Corner key with guide

Hello,

Your corner key is similar to the 95-250. However, your corner has one elongated leg. You might be able to use the 95-250 if you drill out the frame to make the hole in a new location to accept the shorter leg. 

Alternate image for 95-250

Alternate view of 95-250

Another thought would be to use the 95-064 self-locking corners. These corners are held in the frame using the wire clip at the end of the corner leg. You only need to "tap" these corners in the frame to secure them. Note that these corners are offset, meaning the corner tilts are designated for one side of the frame. Take a look at the suggested corners, along with the related video shown on this page. Thanks for posting. 

Dimensions for 95-064