I followed the suggestions here and the Mirrycle mirror for my new Como 4.0 neither of the part the goes in the handlebar end is the correct size. Thanks for any help or suggestions. This is my first post.
Melissa, what is the internal diameter of your handlebar?
If the internal diameter is between 14 and 22 millimetres, the Mirrycle should fit. Even if the wedging pieces seem exceedingly loose at first, tightening the long bolt will force them apart so that they jam inside the tube.