Try to get the 020 parts manuel. The 020T replaced the 020 Supers and is a whole different saw.
The 020 line started out as basically with the 020 AV with a 38 mm bore for the engines, points for the ignition, carbs could be Walbro or Tilltison. These saws were available in both top handle or rearhandled AVP, no chain brakes, just hand guards . The 020 AV with the 38mm bore was then switched to the electronic ignitions, these can vary depending on the module used. Next came the 020 AVQES (whatever) Supers with the 40mm engine and electronic ignition with a chainbrake, offered mostly in the tophandle version, this is probaly your saw, the rearhandle option was available but for some reason you don't see as much on the Supers. Then came the 020T's and the present day MS 200's which is identical to the 020T except the carb and a few other minor things, the engines are the same.
The 020 parts manuel covers both the 38 and 40 mm which should cover your saw for most parts, mine does anyway.
Hope this helps ya out.
Larry