Spend the cash and get the VW ones (arms and wipers) you can get them from some of the traders on here (i think TTS and, prolly awesome GTi too), alternatively you can find the part numbers and order from VW.
They look far better than the retro fits IMO, and the quality is far better than most of the alternatives you can get from the likes of halfords including bosch!
Might seem a lot of cash, but they were the first mod i did to my
Cupra, and they were still on the car when i sold it 3 years later, and still working as good as new!