LCA sway bar bushing seat

My new lower control arms do not have the sway bar bushing seat installed in them, in fact I have never seen a new set with them installed.
How do you remove them from the old arms?
How do you reinstall them in the new arms?
Where do they install, on top of or on the bottom of the arms?
My original arms had one installed on top and the other on the bottom side of the arms, the one installed on the top side seems to be a bit heavier. Which is right?
David.
 
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