I have a few of the older Sachs Dolmars including the 120`s. The regular 120 had a 47 mm bore and the later 120 Super + the 120 si had a 49 mm bore.
The regular 120 would fit on a regular 116 case, they also have the same stroke of 35 mm, no real gain there as the 2 are basically the same saw, cases,frame tank/rear handle etc. Overall they are very good saws, a little outdated nowadays but as a firewood saw they are as good as any out there.
Pioneerguy600