unfortunately, I personally cannot, because my bar nuts are on the 10-10 holding the bar on that one. aint letting those go. perhaps Randy Duncan on ebay can help. he's got literally TONS of parts for these older saws.
They are the same as the thread on my 440 stihl. The way the clutch cover is designed makes it impossible to use them. I can not seem to find a smaller nut with the same thread at any of my local hardware stores. I don't know much about macs
either. Maybe one of the mac fiends can help out.