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Having spent an hour the other day swapping freehub bodies between 3 different 7 speed Shimano hubs I can assure you that whilst they feel like they might all be interchangeable, they ain't.
Rod_Saetan-
Well that’s unfortunate. Can you tell us what hubs they were and why they didn’t fit each other? It’ll be helpful information for the ongoing Uniglide - Hyperglide freehub upgrade route now the older hubs are getting harder to find.
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Without having any other hubs/bodies to try, this is also the impression I get from internetting.
Although as mentioned, I think the freehub off a Shimano 600 FH-6401 would fit the FH-1055. I suspect the only differences are the number of pawls (three on the 600, two on the 1055), and the colour.
Jonny69
ectoplasmosis
The freehub shown in the Velobase link is the one with both locknut threadings so it can take either Hyperglide cassettes or the earlier Uniglide ones. Is it specifically that one you want? If you just need the Hyperglide fitment and don’t need Uniglide cassette compatibility, the best thing to do is get a 7-speed Shimano hub for £10-£12 from one of the eBay shops and take the freehub off. They all have the 10mm Allen fixing inside and are interchangeable. Something like this if you want actual Shimano:
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F392281974302