Autozone actually sells rebuilt MB Genuine Bendix Calipers, I ordered some for my 300SD for a surprisingly reasonable price. You should have seen how surprised I was to see the MB star in the casting! They work great. They have them listed as "Duralast Gold" I think.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles