[Arran]

I haven't seen a reproduction of that pattern as yet, thought there may be a suitable substitute. I also have a model 96 and the grille cloth is even worse then yours, the mice ate it long before I got a hold of it, it is also missing the tube shield from the back of the chassis and two of the knobs, the small and one of the medium ones. Take a walk through some fabric stores, particularly through a type of fabric called Jacquard, Jacquards often used leaf and floral motifs in the weave. If the fabric is some other colour other then an earth tone it can always be dyed.
Best Regards
Arran