rs, It looks like, also measured with dial calipers, your 1.468" dimension matches up with an O.S. 40, 46, 50, FX and AX muffler bolt spacing. I tried to research at Bisson Mufflers but I couldn't find any web site for the manufacturer. My H-9 80" Cub also came with a wooden motor mount and I have gone ahead and used it and it worked out fine for mounting my Saito. My progress with my Cub is moving at a snail's pace. I am going to go fly my Rascal 110 tomorrow so I won't touch the Cub again till next week. No hurry, no worry.
