Vent window gasket kit

[bmw8890]

The vent window gasket kit for the Flavia Vignale comes with two gaskets. One is square in shape and it exactly like the original gasket. The other gasket that gets installed to the frame to seal the glass on the long edge of the angled glass. The original gasket was much smaller than the new gasket and the new gasket prevent the glass from fully closing. Does anybody know how to install the new gasket to the frame so the glass can close properly or have ways to modify the new gasket to make it work like the original?

Thanks for your help,

Brian