Use a sandbag to support the housing and the ball end of a ball peen hammer to gently massage the metal back into shape. You won't get it perfect, but stamped sheet metal has a "memory"- - - - -it really wants to go back to its original shape if you are careful and don't over-correct the damage. Try Ebay for the amber bulbs- - - -there are usually several available.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!