Try this link. They have various size convex mirrors that might be exactly the size of your mirror and can silicone it on. I put one on the right side of my '55 and it works great. They also have complete heads, and adaptors to adapt to different arms. They aren't the cheapest, but good stuff. The mirrors aren't so convex that you can't distinguish the image, and mine cut out the vibration that was in the original mirror. If you can use one of them, I don't think you will be disappointed.
https://www.haganauto.com/category_s/208.htm