Halfords website suggests that's correct. Bosch could do a better job of indicating that there are multiple adapters in the pack for different cars though. I fell into the same trap on mine but managed to pry it off carefully. Lots of patience is needed. The good thing is you don't need the adapter to come off in one piece, so don't be shy about manhandling that once you don't damage the arm.

Personally I picked up a set of Michelin Stealth Hybrid blades from Costco, have the right adapters for the Mk 2 Superb and cost £7.59 each including VAT.

 

No issues with the fitting and they work really well