Just go to a Seat dealer and ask the parts department for some, the parts peoples job is to sell you the parts you want.

A quick look on the seat UK home page and hey presto! 6L0075111 front mudflaps. 6L0075101 rear mudflaps.

You may need to do a bit of trimming to stop the front wheels rubbing them.
 
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The front mud flaps will fit fine but the rear flaps won't fit with the contours of the Cupra/Facelift FR rear bumper.