They are 4 pot calipers. I upgraded to them on my 260E.

Take a read here:
http://www.w124-zone.com/articles.php?article_id=30

The ONLY issue is the dust shield around the ball joint. Its not a big deal, but to do it "right" you should upgrade to the later style LCA's. I've ran mine for 6 months now and had not a single issue.

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