About that slightly too tall windshield. I like my windshields two inches below eye level when seated straight up and looking 100 yards down the road. I find that in the rain a slight slouch has me protected.
Anyway I have cut down shields to fit since my first Windjammer in 1976. It's quite easy to do. A jigsaw with fine blade and masking tape to protect the plastic from the saw foot and your in business. Finish off sanding the edge and it will look like stock. I've never ruined one.
Buy tall, measure twice and cut once.