If anyone is still looking for a mesh windscreen, here's one for sale from an Alfa/Fiat supplier in Atlanta. A little pricey, over $300 w/shipping. Made in Germany.

http://www.ebay.com/itm/Chrysler-Crossfire-Roadster-2003-2007-Wind-Deflector-New-/181753251752?hash=item2a515687a8&vxp=mtr