I didn't want this to get lost on the other thread, but I recently purchased a replacement mixing elbow for my Yanmar 1GM from Ben Cotton in Norfolk, VA. His web site is at: http://exhaustelbow.com/
There are other models available, scroll down through the site and look. He may also be able to make one for you, if you talk to him. His email address is ben at exhaustelbow dot com.
There are other models available, scroll down through the site and look. He may also be able to make one for you, if you talk to him. His email address is ben at exhaustelbow dot com.