The only time a spreader bar maks a difference is when the front end componets are worn & there is a lot of play!
AT dealer I have done thousands of alignments & as long as the front end is tight there isn't 1MM difference of toe-in change, We have 2 Hunter factory computer alignment machines.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)