Givi Windshield Installation

I just installed the Givi Windshield on my wifes Silverwing. The instructions were vague and I am wondering if I should have used the two metal brackets that came with the windshield. The best I could figure out is that they are for marking drilling holes or maybe for a different model. Any input on this would be greatly appreciated.

-Lee

GIVI wants you to use them, but most people do not use them and have no ill effects for their lack.