PIGDOG I was half tempted to put something in about "Bump steer spacers" in my last post, but took it out.
These are actually roll centre adjusters and in theory should not change bump steer, which is caused by the arc of the steering system being in a different plane to that of the LCA (sorry if you already knew it).

i.e when the suspension moves in jounce or rebound, the different arcs cause a steering input to the wheels.
A spacer between the Steering arm and strut does not change the relative arcs of the Steering system and LCA so should have no effect on bump steer.

Having said this sometimes the bump steer is not a linear effect over the rang of suspension travel (Which is bad), it therefore would change the static point on a bump steer curve which would in turn change the rate of bump steer for jounce and rebound.