I think what you need is the Bosch A330H. 330mm/13" blade.
I have read this right haven't I? You have a Polo rear wiper and just want a replacement Bosch blade?
Awesome. Yeah that'S right, I just wanted to double check because I think what I ended up with last time was the Fabia wiper (mainly because I thought I had a Fabia rear wiper...) which is A350H.
Cheers!