US Patent 10150354 Automotive door structure for sail mounted mirrors

A vehicle door assembly includes a door structure having an inner panel and an outer panel defining an internal cavity that extends about a window surround above a vehicle waistline. The door assembly further defines mirror attachment holes and a plurality of collars affixed within the internal cavity. Each collar defines a bore in alignment with a mirror attachment hole of the door structure. The door assembly also includes a mirror assembly having a plurality of protruding fasteners attached to the door structure. The protruding fasteners compressively sandwich the collars within the internal cavity.