Just bought a white
K1, due to colour wanted mudflaps, wasnt keen on rally style as there are not my cup of tea , got a set of ..PAIR REAR MUDFLAPS, SEAT ALTEA FREETRACK NEW & GENUINE SEAT..from ebay ,the curve of the rear bumper is the same, but you do have to modify the m/flaps I used a grinder to get the m/flap to suit the bumper better, also used the cars standard bumper screws to hold the m/flaps in place, and a couple of tie-wraps, and they only cost £12..
Then bought...Mudflaps Mud Flaps Universal Fitting Flexible Rubber x2...again from ebay and again a tenner, then fitted them very easily..........