Go to Home Depot or Lowes or your favorite local hardware store. They should have a catch that is magnetic. You screw the magnet part into the side of the cabinet. The backside of the mirror gets a round steel self stick plate. If you pack it full, get 2 catches. put one near the top & the other near the bottom. A lot of entertainment centers & stereo cabinets with glass doors use this type of catch.
"Sometimes I wonder if the world is being run by smart people who are putting us on, or by imbeciles who really mean it." Mark Twain
AIR 22749 WBCCI 2349 NOVA TAC TN-6
1989 345 LE Classic Motorhome