I use the Smat convex mirrors that clamp with two thumb screws onto the top of the door mirror and have an elastic strap underneath.They must be over 10 years old and are still good.There is almost no vibration and they are easy to fit and compact to store.Milenco do a very similar one but there have been some postings about poor quality mirrors on them.
With the X door mirror you can fold the whole lot back against the door very easily.
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