The later 123 wiper arm has a "dog leg", the early ones are straight. They are interchangeable. The arm rests are slightly different but I believe are also interchangeable. The later ones have a large round button to push to get it to come up.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"