Don't steal one, just make one out of Aluminum. Get a thin sheet from the hareware store about 1 inch (convert to metric) over the size of the rectangle you need to cover area. Make a template from paper from the hole. Make a tab in the template for the tab slot. Also make the template larger than the retangle by a 8 mm. Then cut it out on the aluminum. Mark and cut a hole for the screw. Scribe a line around the retangle about 4mm from the edge. Now use a small hammer to lightly tap and round the edges over. Polish with aluminum cream , find a screw and install.