As the alignment measures originate off the rear wheels, I always set the rear axle centering spec first on swing axle Benzs..
Very few pay any attention to this spec...
For 113 , the spec is 42mm , + /- 2 offset to the right of chassis longtitudal centerline , in direction of travel.
Which, simply put, means you want the center of your pivot bolt hex head to be 42mm to the right of the chassis center-line.
The adjuster is the cross link nuts.
Center line is easily found by dropping plumb bob from the 2 centering reference Bores in the chassis frame.
Or, just make a tool fixture.[ see somewhere here in archieves]
Some can guess at this distance , but I prefer it to be factory..