I wouldnt touch the rares mirrors. As I've posted before, I've broken two. The first I bumped, as I have bumped the factory ones many times. The plastic case broke where it mounts to the metal stalk. When the plastic case is broken like this I could see how thin the moulding is in this area - way too thin IMO.
Second one broke, not sure, probably from a bump, and the metal casting broke in 2 - I often see this sort of breakage in cheap Chinese castings. I thought the rares mirrors looked fine when I purchased them, but as with much of rares stuff you need to look closer to see the corners that have been cut.
I've had many sets of factory mirrors, i've bumped them & they move out of place, just grab them & adjust, & sure I've seen them break, but never in the way ive seen the rares ones break.