Need help finding right seat material

I don't know where your damage is but most often it is the driver front cushion.
If you can find a rear seat that matches from a donor car that rear cover may be
large enough to make the front repair. Rear seats are almost always in better shape.
Done this quite a few times over the years. (Upholstery shop owner)
From the pictures you posted It is a great looking interior. Would be ashame to turn it
into the common option legendary kit that you see a lot. Not that their stuff is bad.
I like seeing the unusual especially when in nice shape. Those are the ones that
truly give a glimpse back in time. New is new.