Can't recommend you any but keep away from the cheap ones from eBay. Had a few pairs of there and they all move above 60 plus.
The joint where the mirror adjusts on the stem seems to be too loose. Can't see any way of making them tighter without getting behind the sealed in glass.
I ordered an Oberon one yesterday-the elongated round one and it arrived this morning, so pretty quick service and looks to be nice quality.
I will let you know what it`s like next weather permitting! :crazy