Alternatively, an aftermarket supplier might be cheaper than a rebuild:-
https://www.trwaftermarket.com/en/pa...utch-cylinder/
I presume that you have considered a repair kit of seals?
You would need to remove the existing seals and take them to a motor factor for matching.
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Any decent motor parts factor should have staff able to identify parts from photographs or the physical part - especially if there is an older member of staff.