Wind deflector/screen for convertibles

[barroom_spert]

Im looking for a supplier of those wind deflector/screens for convertibles that fit behind the rear of the front seats. Because the car is not a standard runofthemill make, it will probably have to be custom made.

Alternatively, any idea where I can buy the screen material. There must be a source somewhere but just cant think of how to find them. Google didnt seem to find them!