moh is correct.
It increases the amount of castor (-) and pushes the wheel a little more out to the side
if couples with a M3 control arm , it will move the wheel forward in the well also
The format for the standard concentric bushes are floating
The format for the 328 sport and 3.0 S50 bushes are solid eccentric
The M3 3.2 S52 evo uses solic concentric bushes , as the control arms for the Evo compensate for the required camber
Part numbers are
M3 3.0 Solid ECCENTRIC 31129064875
M3 3.2 Solid CONCENRTIC (a la standard centralised) 31129069035