If you look at a stock F4 seat there is a strap that runs across it kind of seperating the rider and passenger portions of the seat. There are two clips that you slip over this strap and then put the cowl over those clips and screw the screws into them through the cowl. That's how it stays in place.

If it wasn't 3am I'd go take it off and take pics of it....................

Here's an old pic of my bike; you can see the strap in it: http://www.dragva.com/forums/showthread.php?t=48630