@[deleted] here are some GM part numbers for reference.
Astra G Z22SE(L61)
(Standard Clutch)
Kit, Clutch Disc,Pressure Plate and Slave Cylinder (used with F23 Manual Transmission)
GM Part # 93185882
Cylinder, Assembly, Clutch Slave
GM Part # 55558371
(As per Si's link above)
Screw, Hex.Hd, M7 x 22, Clutch To Flywheel
GM Part # 90065294 (6 required)
Calibra C20LET(LL7)
Disc, Assembly, Clutch
GM Part # 90443424
NOTE: This kit comes with a release bearing not a CSC
Hope this may help. 🙂