Yes very stiff, but not now
Found a Dutch supplier for this Wind Deflector repair kit material on eBay £25 + £9.99 postage
I also have a wind deflector which has a net material in a metal frame that fits behind the front seats. The net has some holes in it, can you buy the material to patch the holes or refit a new screen into the metal frame. Bought a hood roof cover on eBay for £10 which seems to work, bit flimsy but it stood up to strong winds and torrents of rain last week.