New style vacuum pump for all Mercedes Benz Diesels between 1984 and 1995, including W201 190D, W124 300D, W210 E-Class diesels & pretty much every model equipped with a OM60X motor.
The original pump on these motors was notorious for failing, breaking apart and sending pieces into the crank case. The new style pump is both more reliable and has an updated gasket that prevents debris from falling into the crankcase.