The factory gasket is riveted to the pan and the ACDelco gasket is exactly the same. It has 2 small holes for your new rivets. Once the old one has been drilled and cleaned, simply rivet the new one. This saves you from having to dislodge the gasket when reinstalling the pan. It was easy and no leaks, thanks. You have the option, you don't have to use new rivets, but this makes it a lot easier and keeps it in place while you screw it back on.