I’ll buy a compass cutter to make a clean circle, I’ll try to measure it but is there anybody who has done it before know the exact radius?
What circles are you talking about? the stick opening, buttons, or both? Also do you want the dimensions for the art to fit under the buttons, or around them so you can easily swap them?
I would also ask in tech talk here http://forums.shoryuken.com/categories/tech-talk if you want a speedy reply. This question really has nothing to do with the site itself.