I am looking for repair corner keys for my storm window screens. I tried to attach pictures with dimensions but kept getting errors. The pieces I removed are marked M579 & M580. The leg for the side rails are 3/16 thick x 9/32. The leg for the top rail appears to be 1/8 thick x 9/32. These are the tilt corners. I also need the bottom corners which are 3/16 x 9/32 on both legs. Can you help me?