That link is the one that goes about 45degrees to the direction of travel. It is the one that makes the rear end steer under load. That's the one!
Like the camber link, its original design was basically the same through the 210 and 202 chassis. The latest model is the one sold for all uses. It was improved by adding to the bushing at the weak end. In order to make the bushing bigger the steel insert was reduced. I think the original bolt is 12mm and the new hole is 10mm. Proper parts designation would have indicated two additional parts needed. Their numbers are in these archives a few times. They are a 10mm bolt and a sleeve that gets inserted into the original 12mm hole in the bearing carrier. The sleeve makes the hole into 10mm and accepts the new bolt which passes through the new arm.
Bosch Master, ASE Master, L1
33 years MB technician