Hi Iain, welcome to the forum, 🙂 I’m not aware of a company who makes exact replicas for your make and model. However, there are companies who will make a set of curtains if you can provide measurements or a template, like the old ones.
I think the cheapest option would be for you to find a suitable material, and then find a local shop (dry cleaners, yellow pages etc) who can make a set up for you.
Regards
John