Ok

Here's 3 AI files made from CS6 to Illustrator 8

32mm x 32mm workplane with a circle in it
https://dl.dropbox.com/u/44982094/32mm.ai

20mm x 20mm workplane with a circle in it
https://dl.dropbox.com/u/44982094/20mm.ai

14mm x 14mm workplane with a circle + another smaller workplane aside of it with a smaller circle in it
https://dl.dropbox.com/u/44982094/14mm.ai

Hope this can help :)