I need to reattach door spring on Kenmore 11070927990 dryer. Where do they attach?

At the bottom of the front cover. Look at these diagrams: https://dl.dropbox.com/u/8010163/Whirlpool%20Dryers.zip
The holes could have rusted through. If so, you should tear it down, clean it. And drill another hole for the spring. The spring can also cause it to wear through the metal.