The cross is normally on the video card it self(but it may be a slot a well. you HAVE to have the 4 pins around it, as long as you have those, you are good to go.). The adapter has a flat plate.
Here is an example of those adapters in use.
Most newer cards will have 1 port that can do VGA and if they have more DVI ports, they will NOT do VGA.
The top port will NOT work with a VGA adapter while the bottom one WILL