Can the mirror and motor on the passanger side of a 1995 Mercedes C280 be replaced without removing the housing?

YES IT CAN BE DONE. MOVE THE MIRROR THE THE FAR MOST DOWN POSITION AND UNCLIP IT FROM THE BACK OF THE MIRROR AT THE TOP. (THERE SHOULD BE A SILVER SPRING TYPE CLIP). MOVE MIRROR UPWARDS WITH HAND AND REMOVE. REVERSE ORDER TO INSTALL.