The front rubber mounts are sandwiched between the chassis step bearing mount and the torque arm. These can be replaced by putting a jack under the differential and one under the arm near the step bearing. Once you jack the diff up enough to raise the wheel, the torque arm can be slightly lowered via second jack to remove/install new rubber .
Talc works well here.
As I noticed you have an early 190, there is a step bearing modification that you may want to see.
I can jpg that to you/anyone if you get back to me via email. [ Workshop Supplement 1/15.2.57-Type 190]
The torque arm/axle bushing require arm removal and a press/tool . Little more complex.
I also have that info and easier to send out the jpg.
Job 35- 4/4.
Arthur