Two part clutch kit as per original manufacturer
LINK
And if I'm not mistaken, this looks to be identical to the original slave cylinder.......
LINK
I fitted a "genuine" three part clutch kit in December 2018 along with a new DMF, have covered 24,000 miles, and although still light, I have occasional clutch judder.
This is the problem, there is scant quality control in the sourcing of "genuine" parts, this has deteriorated since the sale of XPart from Neovia Logistics, to their new parent company Leacy Classics, who appear to think cheapest is best, coupled with selling at the highest price the market will stand.
Take your pick, I won't recommend any hydraulic parts made in China, and you can guess where the "genuine" part is from.
Given that, if you wish to take the risk on parts of this type, you can buy an unbranded slave for £30
HERE or go for an LUK slave for £43
HERE
Borg and Beck, sadly are nothing more than a label on a box these days, especially the stuff being currently sold.
Best of luck
Brian