I'd prior to this bought the dorman product (mirror and bracket) for use on my ford truck. That one was horribly unstable and prone to shifting when the door was slammed or the wind got too gusty, and vibrates quite erratically on the freeway.THIS ONE is rock solid. I adjusted it once, drove a few hundred miles, and haven't had to adjust it once.It is a symmetric flat mirror; the back is of a constant curvature (unlike the asymmetric curve on the oem ford truck mirror). The ball head is much larger and more solid than on the comparable dorman product, so I expect this will last at least as long as the original mirrors.