Not sure what make my extended mirrors are (Milenco?), but they fit very well and securely on my '06 X-Trail. They have two screw clamps, where a tapered portion slips into the gap twixt mirror and housing, then the circular foot is screwed down onto the top of the housing. A sturdy rubber strap then wraps around the mirror housing and clips onto the bottom edge. A strong metal rod protrudes from the clamps and the quite large mirror mounts on the end of the rod via a ball joint. The X-Trail is at least the fourth car I've used them on, so they have done very good service!