The nut on the back would work, but it will be a bitch to get to and hold while you turn the screw. If I am not mistaken, there is a clip that clips onto the coolant bottle that is threaded. I would recommend just buying that clip and fixing it the right way. If you have extra screws, they more than likely go to the front "dash", the big black piece behind and on both sides of the speedo that hold all of the upper together. It's kind of hard to explain. I had to replace the whole front fairing and I had 2 extra screws on mine, come to find out there were two screws a little lower than the ram air tubes I had forgot about. They weren't in plain sight. Like mentioned already, you can just order the screw. My dealership told me it would take a couple weeks to get them, so I ordered them off of bikebandit.com for like .60 a piece. Got them in 3 days. Good luck.
-RIP Robert W. E. Anderson, US Army
-RIP Tom Rose
-God be with Garry C. W. Pruitt, US Army, Middle East
-2004 Red R1
Everyone has a Jekyll and Hyde, you just have to learn how to control Jekyll and when to let him loose!
"Life's tough, but it's tougher when you're stupid" ~ John Wayne