They are paired and concaved to allow toeing in e.t.c If you move them around you loose that control over pad angle.
one side has a thinner concave spacer than the other and you can switch them from inside to outside. and if you need something in between, add a 1.5 or 2mm spacer to the thinner one.
one side has a thinner concave spacer than the other and you can switch them from inside to outside. and if you need something in between, add a 1.5 or 2mm spacer to the thinner one.