Wrong information there buddy!
The 056 mag bore is 56mm, easy to remember that. They also used the front exhaust muffler port & the side tube, thus a dual opening muff. The mag crankcases are different part numbers than the 49, 52, & 54mm bore saws too, as the mag cylinders have a wider 4 bolt bottom pattern.
The super is a 54mm bore, and it originally used a blinded front exhaust cover, so they exhausted from the side tube only. There are some early 54mm supers that used a front port only, and had no side tube port, so the cooling fins were not trimmed off on the lower front right side of the cylinder...
I sure miss Lakeside53, he is a super resource on all of the Stihl saws.