Auto body repair & detailing: Rear-View Mirror, rear view mirror, plastic casing

Question
As I was driving, my passenger rear-view mirror was impacted with an object.  Although the fixture is still attached to the car, it is wobbling quite a lot and there is a visible crack in the plastic casing for the rear-view mirror.  It is electrically controlled, but those functions work perfectly fine still.  Again, it is only that it is wobbling (and I am afraid it will get worse if left untreated).

Is it possible to repair the wobbling fixture without purchasing a part?  Is it possible to buy just a new casing rather than an entire new right, rear-view mirror since it is predominantly is great working condition?  If so, where can I purchase that part?

Answer
KIM....THE WOBBLE MAY STAY THE SAME OR GET WORSE DUE TO MORE DAMAGES CAUSED BY DRIVING AROUND.
THE  AS MIRROR CAN BE PURCHASED FROM A SALVAGE YARD  AT A REDUCED PRICE. THIS WOULD BE THE MIRROR
ASSEMBLY. TRY STOPPING BY A LOCAL BODY SHOP TO SEE IF THEY CAN LOCATE YOU ONE AND HOW MUCH IT WOULD BE. THAT IS THE MOST COST EFFECTIVE APPROACH.

GOOD LUCK