I have a set of these (well not the TTT ones) on my ae86. You dont need bushes as the heim joint provides the movement needed in the setup. I think they are a fantastic upgrade that helps maintain geometry, particularly your caster throughout your suspension travel in bigger bumps. They dont compromise ride quality (i think it made my car better) and you get more caster adjustment. I was going to recommend some in my other post but thought you were playing it on the safe side for rwc.

maybe i should become a salesperson for ttt haha