My local independent screen fitter can get just about any screen for any car. He says that most of the screen manufacturers although they may no longer have stock do normally keep the paterns so getting a new screen made is not a problem, just more expensive and of course a time delay.
Another solution when all else fails is to have a screen cut from another. e.g. cut a car screen from a larger truck/bus screen. Trick is getting similar curve/profiles which can be done with a little research.