Tritonman, welcome to the forum. Sorry for such a untimely response. Seemed you got pushed down the list.
Are you talking about the 1/2 windshield?
They say you need the back windshield to help the dust a bit.. Or maybe it was the front windshield, roof and rear windshield.
I'll find that post.
Maybe some other members will chime in as I don't have any of those items just yet.
Stay tuned.