Graham,
The part # (93185882) listed in your link above is for Z22SE's (Astra, Vectra, Zafira, VX220) with F23 gearboxes. (I notice bidding has ended on that item).
As Carl mentioned above the Z22YH's have a dual mass flywheel whereas Z22SE's don't, therefore the above part is incorrect for your car.
The part # coming up for your vehicle is:
93185901 (16 06 558) KIT,CLUTCH DISC,PRESSURE PLATE AND SLAVE CYLINDER
However, I would ring your local Vauxhall dealer parts department to confirm this is correct, also part numbers sometimes get superseded.
Hope this may help you. 🙂