The Bosch retrofit aero wipers are easier to fit, BUT in my opinion the Lupo wipers are nicer to look at

they just need a bit of work to get them working spot-on.
Tom W, the part numbers I have for the arm - you need two passenger-side arms - is
6X2 955 409 C. The wiper blades are part number
1J2 955 425 B.
Both those numbers are off my original packaging!
Hope this helps
Cheers