No i dont think they will, and if they did they would look pretty crap. In my opinion its only worth having front flaps anyway, as these keep the crap off the side of your car, not that these will fit a 100hp either.
As for only needing them on the front, I have to disagree. The van-like rear end of the Panda means that the back window quickly becomes covered in road grime when driving at higher speeds. I often drive from M6 J7 to J6 and in a couple of miles, the wash-wipe needs to be used several times during poor weather.
Let's face it though, all mudflaps make a car 'look' slower [apart from a WRC car, perhaps]