What mufflers will fit ms261

[G-Woody]

I bought a ms261 to fix up that was missing the muffler. Most people don't need replacements because they are stainless so no cheap aftermarket mufflers are available yet.
I would rather fit some other muffler than pay $50 a used 261 muffler. I was thinking a ms361 might fit but don't have loose parts to try them. Any ideas on what's a close fit ?

I'm not on the clock any more so spending time to save $ is my hobby.

 

[G-Woody]

ms361 or 271, 291 or 311, 362, 391 look similar to a 261. Hard to tell by pics, does anyone have a loose muffler to check out ?