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You still aren't getting it. There are 3 different rim spline sizes. On the large, everybody matches. So you have a large spline (universal), a small spline Stihl and a small spline for everybody else. The fact that your large spline fits the 661 has no bearing on the two different small spline...

Stihl and Husqvarna use different sizes on the small spline sprockets. The large spline are the same size though.