Hi Joel, I tried adding to your thread looking for freeze plugs but it was closed. I also contacted Chris White but he didn't have a source, only the note that it was a common size. I am rebuilding a 951 and dont know if that one is the same size but I can't find it anywhere. What did you use and do you remember the size? My old one specs to 16mm and the closest generic I can find is 16.2mm.
Thanks!
jay