Milemar
I can tell ya : I've got the RE shield and its 16" from headlight cut-out to the top of the windshield with a slight upward curve at the top , and its 18" wide. Also the mounting system is non-adjustable but solid.
I'm 5'10" w/32" inseams and ride w/open-face helmet & sunglasses. The shield is barley tall enough for me.
I'd think ... if your 34" inseams and 5'11" then it would work for ya as good or better than mine fits me.
I see the Givi shield is a little shorter. The up-turn at the top of the RE shield makes a big difference.
I'm averaging 65mpg-US gallon with this shield.