A 14" bar is just about right for the Super 2. It's possible to buy a longer bar but it cuts down the power. I think I have a 20" bar that will fit on a Super 2, I think it came off a 240 or 245 Homelite saw but I never have put it on a saw.
Yeah, I don't know how many bars I've filed that little square out of when I didn't have a Homelite bar handy...The Oregon mount code for those bars is A061. They are distinctive, having a square/block shaped cutout at the front of the open stud slot.
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