One suggestion that I would give is, try to find out which brand of blades are fitted at factory, normally Valeo or Bosch depending on VAG model type, then buy that part only if available without it coming as a "fit all" as they tend to "fit none" properly! If you can't identify which brand is fitted to your car at factory, info normally gleaned from forums, then get local Audi dealer to order in original parts and not just fob you off with "just as good" aftermarket parts which will end up being "fit none" types.
Next moan, at least for VW and Seat original replacement wipers is, they might be available as RHD and LHD but VAG can be lazy and supply LHD blades to a RHD market, but that is easy to handle if you accept that has happened as you just need to reverse some parts on some wipers - might be that these cars don't have these issues.
Initially spend a bit of time comparing what you have been sold with what is on the car - as long as it is still on its original wipers. Taking a bit of care now will avoid you getting annoyed with your under performing new wipers.
For cars built up to roughly March 2011, 8K2 955 425A (PASS) 509MM and 8K2 955 426A (DRV) 609MM
