The mounting plate is not standard for North American lighting.  We had to call an Electrician to remove the original electrical box & install a small rectangular receptacle box.  Then call a Contractor to repair the drywall.  The gap around this oval mounting plate is slighting over an inch narrower than North American boxes, leaving a unsightly gap to the sides of the mount.  This detail should have been documented.  Do not purchase unless you are willing to pick up the Electrician & Contractor costs.  Please revise the dimensions page & note this problem for other's thinking of purchasing this Mirror.  I would not have purchased if this was clearly stated.  : (