064 Mufflers,whats out there?

[Yukon Stihl]

Hi All
I have a couple 064's that came to me without mufflers,then a buddy that cuts wood with a 064 asked me today if i had an extra muffler.
Any aftermarket ones ? that fit?
Do the 066/660 interchange?
Thanks

 

[Hoggwood]

The 064’s can use the 066/660 mufflers with the spacer. Don’t have the PN, but Stihl made a spacer for that application. Or, as in my case, I just made one and threw a cheap Farmertec can on there. YMMV.