It's only sounds redundant to someone who doesn't know what they are talking about. I thought I remember you mentioning you once worked on MB cars, maybe not?

On a 124 chassis in addition to the two rear mounts which attach to the differential rear cover, there is a single front differential mount that secures the forward end of the differential, it uses a 8 mm Allen head bolt which connects to a 17 mm nut which resides above it in a channel of the subframe on passenger side of the differential immediately adjacent to the differential's ABS sensor. There are upper and lower rubber disk mounts that sandwich a tab on the differential.