rear windshield

Or what ever you'd call it.

I've got a very nice custom from front windshield that I pulled off this summer for two reasons. The heat and the dust. I know the whole low pressure vs. high pressure thing that creates the dust bowl we get in the cabs. Won't be long and i'll be putting the front windshield back on because of the colder temps and I'd love to have something for the rear that seals enough that it works at keeping the dust out. I have a vinyl roll up flap that came with my Gator and it's about a joke. Any thoughts?