Weird old mtb freehub

Hi im trying to renovate a very old alpinestar cro mega mtb.
It has 6 speed casette with a really odd looking freehub that has a big step in the freehub halway along so the inner half of the freehub is fat & the second half for the 3 outer cassette rings is alot narrower. It does have some kind of the hyperglide type groove on the freehub, for the cassete rings to fit on the right way.
Teeth aren't in bad shape but its very rusty, am guessing there no way to find a replacement 6 speed cassete that would fit?
It has 6 speed casette with a really odd looking freehub that has a big step in the freehub halway along so the inner half of the freehub is fat & the second half for the 3 outer cassette rings is alot narrower. It does have some kind of the hyperglide type groove on the freehub, for the cassete rings to fit on the right way.
Teeth aren't in bad shape but its very rusty, am guessing there no way to find a replacement 6 speed cassete that would fit?
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mine looks alot more beaten up though.
Probably get answers quicker here.
http://www.retrobike.co.uk/forum/
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There is no secret ingredient - Kung Fu Panda
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