Spacers? Are these used for wider stance for sportier look?

I have seen some cars that have stock tires that are wide apart (when measured from front driver's side to passenger side tire), and it gave the car much sportier, aggressive, and more balanced stance without changing the tires to wide aftermarket. These W124 bodies are very well complimented with wider stance and wide tires, especially when seen from the rear.

How many millimeters of spacers are right for W124? Which branch do you recommend? H & R? Is it better to put in ONE right size or multiple spacers?