Helix Organic Clutch Kit in Calibra Turbo 4x4 running Z20leh

[Robs Calibra]

Hi

Does anyone know the answer to this?

I have a Calibra Turbo 4x4 that is fitted with an Astra VXR engine Z20leh engine.

I still have the F28 Gearbox. My car is in the Garage at the moment having the Helix clutch fitted, however the garage said that the cover is around 2mm less in thickness than it should be as it will not sit tight.

I have a Z20let Flywheel which courtenay confirmed to me today. Would this make a difference? I dont know what to do on this. Will be checking the thickness of the Z20let flywheel tomorrow versus a c20let flywheel to see if there is a difference.

Any Ideas?