I did the same a scooter and it's real cheap. I did make to brackets that I riveted to the screen frame, the I used the two threaded tubes that were already welded to the radiator.
This is what we use on the sprint car and would work great also.
$15.00
http://www.speedwaymotors.com/Radiat...reen,3546.html
apx. $20.00
I use this if I'm traveling on the highway because of the HUGE amount of summertime bugs.
http://www.speedwaymotors.com/Honey-...DisplayId=3546
(emberglo66- how much is their small center counsel) ?