I looked for weeks, couldn't find any, and gave up. Instead, I used a piece of Starboard
as a bezel to cover the original hole with a new 2" cut out for the new depth sounder head.
However, I read an article in Good Old Boat mag about a guy who gutted his old unit,
installed a new "inner facing" with the new cut out and re-installed the assemblage.
I could have used that idea 7 years ago!