Here's how the 243mm foldable mirror from the first link in my first post looks compared to the stock mirror. There's a longer 280mm option if you want wider or higher mirrors.
The "boot" at the base of the round mirror itself is bogus: it doesn't bend there. It pivots around each of the 3 axis that are obvious in the photo. It has detents in the movement at the "knee", and to keep the mirror foldable I couldn't tighten that part all the way. On the freeway I noticed slightly more blurring in the foldable mirror vs the stock one. Might blur less than stock if that were fully tightened?