Ordered a pair of Polyurethane Bushings for the Lower Control arms. Will be replacing the bolts with the eccentric camber/caster bolt, part #2023300118.

My question is, how many of these do I need? There are Front and Rear bushings on each control arm, do I just need one bolt on the Rear on each side? I believe the rears would adjust Camber, wil it adjust Caster as well? Should I replace the Front bolt too? Will there be any benefit to that?

Appreciate the help!