This is my '83 headlight  assy .      

   I used UFO  105 mm (plastic lens ) unit   to suit my    '83 ( D.C repl)   headlight housing .
   '84 & up  Husky   use different housing to '83  & have  LARGER   light ..,.so be sure what housing you have ....  &  be sure to measure  first.      
   I had to make up 3 small mount tabs to secure lens assy   using the  3 screws , (as seen in pic)  ,
     to housing ( as per original look )  
   UFO   Part No    ME 08076 ;   (105mm dia lens)
  Got it from this place  ;   (look in electrical  / ignition section)
http://www.enduroklassiker.at/artikel/index.php?mid=99      ( NOS    glass h/ lights still can be found....... but you will pay plenty more for one.) 
 Hope this helps  
    Regards ,
                        Steve