Ah... NOS spares in packets are few and far between, similarly there might be nobody with one kicking around in their spares box.0
Might be easier to buy a set of nutted Tricolour 6400 and either use as is or mix and match the best bits and have a spare set left over to keep or sell on. Hilary Stone has a set of nuted 6400 for thirty quid.
Shaun