RE: Welcome to Club SAITO !
IronCross:
The fully machined cylindric mufflers were all pretty much the same, differing by having either a twelve mm thread for the mid blocks or a 14 mm thread for the larger engines. The small block engines, the FA-30 and so forth, had a male threaded end with no intermediate pipe. They did offer a 90 degree adapter to point the muffler to the rear on the FA-30 and similar. These little ones were 10 mm thread. I've never seen one as large as a 56 with a 10 mm thread. Is yours a really old engine?
Bill.
PS: Hey Dave! Thanks for the nice words.wr.