Like everyone has said if you changing your seat do that before you change your shield. I had a BS screen and around town I used the bottom section only, on trips I flip the upper in. It was pretty good until I won the Clearview Shield at the second Annual rally! Now I have the largest Clearview shield with vent. I'm am not that tall, but I do sit tall and I need a taller shield or my helmet will blow all over the place. I'm currently happy with my choice if I get warm I open the vent and Baker shields.

I believe the Clearview is 19" to the top. The bagger is 11" lower only and 18" or 19" with upper section in. Choosing the right height is fairly easy, mark off 50 ft in front of the bike and sitting on the bike if you can see over the shield and see that mark your good to go. With the clearview I can see 35' mark. I'm only 5'7", but like I said I sit tall in the saddle.

My avatar has the BS on it when the wife and I went to the 2nd Annual Rally!

Here is the Clearview -
Attachment 10256