The problem with the W126 euro wipers is they are complety different than the US ones. The arms are different and the motors are mounted in different places with different shafts. As far as I know to do the proper job you need:

New motors
New arms
Proper brackets
Proper trim below the headlights painted.

The US wipers look stupid on the Euro lights because they don't do anything.

I keep hearing the $300 figure float around. Now I would contact a European member maybe they could go to one of their junk yards and mail you the parts? Or maybe the dealer would be able to help?

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200