wiper problem

The windshield of a post sedan is 1.5 inches taller than no post hardtops. The sedan calls for a 16 inch blade. With arm attached at blades center the difference is only a half inch toward top and bottom. This at least suggests the wiper arm on a post sedan would be a tad longer. Regardless, if a 15 inch blade scrubs the top a 14 inch blade will lower the tip a half inch. I doubt the half inch less at the bottom would make a difference but at the same time the unwiped segment at the bottom of yours is already a little oversize due to a longer arm.