Originally Posted by fraser9764

I think you mean geometry correction shims. Mike rainbird does toe shims which give a small amount of toe in on the rear, these help with tyre wear and give them rear a more centered feel. Either them or these camber shims that are floating about, the just change the rear camber to correct for lowering springs etc. The only way to do it properly though is a six degree rear beam, although you are talking a good amount of money.