I am having problems keeping my drivers side mirror on the car. It keeps falling off as I drive down the road. Initially, the actual mirror and cover fell off and where hanging down. The motor was OK. Now, just the cover will not stay on. Is this something I can replace a clip, etc. or do I need to buy a complete mirror and cover? Has anyone else had this problem? Where is a good place to buy the clips, if possible, or a new mirror and housing/cover? Thanks!