I agree, I am suprised it wasn't right but there was no way they were going to bolt up without anything added.
It's all sorted now though the extra bits worked a treat. it all looks nice and square and well seated. Interestingly enough the doughnut bit from the old poly bush was about the same thickness as my spacer so I modded that to fit around the outside of it. Can't hurt to have the extra contact area I figure.