Whoever makes the propshaft should/will use a sliding joint so absolute dimensions not an issue as long as they are within the joint's range. There are a few companies out there that make custom propeshafts. Mine was made by Dave Mac. Well made and balanced although I had to ream out the centre hole on the flange at the gearbox end as, on my build (E30), this was used to centralise the propshaft.
Cheers, Robin
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