Searching for awning lock pins rivots

I purchased a house in south Florida and have awning windows from the 70's. I need the pins/rivots that allow the windows to lock closed when retracted. The attached pictures show the windows and the pin/rivot inserted into the side of the window panel. There is supposed to be one on each side of the window panel. When the window closes, it contacts the frame and then raises up about 1/4 to a 1/2 inch to lock the window into a hook,for lack of a better word,against the frame.