This is a very nice inner rear view mirror taken from a 1970 Chevelle many years ago and stored properly since.  There are a few light scratches on the back that would probably polish out and there is one small flaw in the bottom corner of the glass that I have pictured.  Very nice driver piece.  I don't know what other cars used this same mounting bracket.  Possibly the Nova, Camaro, Impala, GTO GS 442.