Longmtnman, the biggest problem with the Triumph Summer Screen is possibly being too short. If you are taller than 5'8", the buffeted wind hits you right in the head. Clearview Shields
http://www.clearviewshields.com/index.htm has just finished making the first larger factory replacements for the America/Speedmaster Summer Screen. The first is 17" (factory is 13 1/4") and will also feature a slight reverse curve at the top. They also plan to eventually offer one shorter and taller than 17". If you are intested, you might want to call them directly to avoid confusion with other Triumph models they make. My replacement should be arriving very soon.