Spreader bar!?!?

This sounds like BS. If you have a way to measure and a way to adjust, what else can you need? There are some unit body cars that must be basically "bent" into position, but an MB is not one of them. There are adjustments for caster, camber and toe. You must be thinking of a Honda, they only have adjustment for toe, everything else is put in place with a porta-power.

My $0.02,