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Replacement springs should be easy to find, I think they are just standard closed ended 3.5inch. If thats the case then you have a whole catalogue to choose from.
SAE Papers show advantages to having drilled disks in most high performance applications, mainly the removal of the gas and better heat dissipation. Not need on a Clio though unless its for looks.
After doing a study on drilled and grooved disks at University the conclusion was: Taking a plain disk and drilling it generates weak points and focal point for stress resulting in cracks or fractures.
Most pre drilled disks are cast with the holes, draft angles and chamfers to stop them...