Turns out the flywheel for some reason is unique to the 2.2 z4, even the 2.2s in the e46s use a different flywheel, and the 2.5 z4 uses a different flywheel even tho both engines have the same 5 speed gearbox.
They all appear to have the same clutch tho,
The frustrating bit is it looks like Luk have stopped production of the flywheel for the 2.2 and I can only find a genuine example at over £1200, which is probably the value of the car.
And I thought it would be the lack of airbag modules that would end up scrapping my car in the future.