Do you have any pictures of the front? Could be made by sea-dog but it's hard to tell.
Looks like Livorsi makes two different lights LEDNL2 and LEDNL3When one of mine went out on my 2012 Vantage, I called East Cape and they told me it was a Livorsi light. When light arrived from Livorsi, I had the same problem as you. I think Livorsi just changed their design over the years. I just used a fiberglass file to round out the hole. Pretty easy fix.