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Yeah, not so easy to find one if you are not looking to spend a fortune on E-bay. Try here (wanted advert), local listings, bike kitchens and a LBS (preferably one that has been around for longer and might have a spare and used part bin) Alternatively you could mod a new or used hyperglide 7/8 speed casette (very cheap), but you would still need the sprocket or lockring to mount it.
thanks! that's had me stumped for ages!
If anyone can sell me a cassette on the cheap that would be great.. I don't have a spare £50 knocking around...