There is pics of the old and new style of bearing arrangement:
https://www.benzworld.org/forums/w124-e-ce-d-td-class/1655942-1987-300d-what-look-2.html


If your 85 has the original vacuum pump it should be the later version without the exposed balls and cage.

__________________
84 300D, 82 Volvo 244Gl Diesel