That's a nice separator.
I'm sure that would work for removal.
The 'nut & bolt & washer' install method will not work on your 190 unless you have just the right adaptors that press on the 'outer metal flange' on each bushing, like the special MB tool shown in the manual for this purpose.
Still struggling to explain without drawing a diagram, but the important fact is that pressing on the metal faces alone will not allow the bushings to seat completely.
I should have taken some pictures for community benefit.
Best of luck.
1986 300E 5-Speed 240k mi.