SMS auto fabric stocks reproduction original materials. Start there and get in touch with a local upholstery shop.
Thank you. I have contacted SMS and they will send a sample for me to check the match.
Just be aware they take time. A lot of time. Expect the sample in a month. After ordering and paying the full amount expect at least three months waiting before you have the materials.
Just to add, almost any upholstery shop with any history of working on old cars will be very aware of SMS Auto Fabrics. When I had my seats redone my local old school upholstery shop were able to order my Sandalwood Dover fabric for my seats direct from SMS st a discounted price.
If you are doing just the front seats because the back ones are fine, and in many cases they are, make sure you get a large sample to make sure they match. They probably made different run lots and they can be a few shades off and you won't see it until until you reinstall them. A small sample may not show the difference. I ran into this when I did my 76 Coupe De Ville. good luck