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:
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.
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