I have been reluctant to post on this forum, as some has flouted my previous advice as non-sense but as a Jeeper here is my 2 cencs that is in no way gospel and I accept no responsibility (Or criticism) for it.
I built and installed my own heim jointed control arms. I bought mine at my local bearing shop and they are actually called pillow ball bearings. IKO is the manufacturer and the part numbers are POS14 and POS10. They do have grease nipples on.
The flex is amazing! Even with standard coil springs and shocks! One down side is that they make a Clack-clack sound when on the track as the joint moves from one side to another.
Hope this helps
Do a search on Heim joints and you will see my posts on the subject.