I read that before - that the poly does not locate the LCA ...
This image shows the opposite - the poly has a lip that seats it completely in the shell -
I did have to get new pins, and these are just suspension pieces that have slots to tighten the pin nuts on - but the setup works great - it's not greasable but has never squeaked in the 5 years it has been on the car. I prefer them to the rubber pieces for my street car.