SPC Performance Mercedes C Class Camber/Caster CamAdjust camber or caster + . 3deg using the factory offset in the lower control arm bushings of many Mercedes C, E, and S Class passenger vehicles. Place the offset bolt in the forward arm's bushing to change caster or in the rearward arm's bushing to changecamber. If both camber and caster change are needed, you can use 2 kits. SPC uses a hex chromate free finish and offers a 700hr salt spray test for the best corrosion protection available.