Rapid Online do a few new-production carbon compositions which look the part
https://www.rapidonline.com/Carbon-Composition. HiFi Collective do the same resistors at a higher price but cover a much wider range of values
https://www.hificollective.co.uk/com...resistors.html. RS sell them too, at an intermediate price, but there is a minimum order of 25 of each value I think. They're marked as 5% tolerance but I don't know whether their long-term stability is any better than the original ones (then again maybe you're not looking at performance on a 60-year timescale). They'll be noisier than carbon films (much better) or metal films (best).
Cheers,
GJ