After reading the initial post, I was going to point out the same thing that David Poole just pointed out, because it happened to me. After the plastic piece snapped, it was scraping on the inside of the wheel and it sounded like something dragging. It was an easy fix. I should have replaced both sides at the same time, because a few weeks later, the other link snapped. I wasn't sure if the older cars used the same plastic suspension links as mine.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles