My left side was wobbly and eventually fell of in my yard one day. I snapped it back in without really "fixing" anything, and a week or so later it fell off again in a paved lot and shattered. I ordered a Dorman replacement glass from rockauto. When that came in, I glued the glass to my stock plastic backer, and cut a new bit of thin foam to go between the backer and the power motors. Nice repair, and no more wobbly mirror now.