Muffler for 720 Garden tractor

There's several Onan two cylinder mufflers on ebay, Used. Don't know how close these would come to fitting yours's
 
I knew an old man that made a Muffler out of stainless steel for his 1960 Cub cadet.

I've never made a muffler, but at today's prices it's tempting to find someone to make a SS muffler.

I remember mufflers falling off cars.
Do today's cars have SS lifetime mufflers?
 
My Onan B48G in my 1981 vintage 982 IH Cub Cadet has two mufflers, one for each cylinder, they run vertically in front of the two cylinders. Good chance they would bolt to your engine. They do a good job of quieting the engine.
The mufflers for the Onan engines used on IH 982's is not a high volume application, maybe your local Deere dealer might have something, they used loads and loads of Onan engines. Or maybe your local welding supply house could get something, lots of portable welder/Generators were Onan powered.
I'm thinking my 982 may have got new mufflers installed right before I bought it. It had 4 new tires, new paint, engine completely overhauled except for Onan's poor excuse of a governor, and a fairly new but cheap seat. If I had to replace those mufflers I'd build my own. Unless you have access to scraps of stainless tubing, or sheet, and a roller, fabbing a stainless muffler, actually two, would be costly and time consuming.
 

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