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You can fit them rear discs mate. Obviously you don't need the abs rings on your Cup but makes no difference to fitting.
Ensure you refit the little spacers behind the rear discs and re-torque to 175nm
I'd be taking it back to the garage asap to get them to plug in into diagnostics machine and seeing what it says, before spending any more money on parts tbh mate.
What plugs did they put in as these cars can run rough when not using the factory fitted NGK platinum plugs.
I've used paisleyfreight a few times, been spot on.
http://www.paisleyfreight.com/alloy-wheel-courier.php
There is a cheaper way of doing it by wrapping 2 parcels of 2 up iirc but can't remember which company it was with