What Ed said is true.
Idler arms were rebuildable and I rebuilt mine. I believe Cars was the source for the kit. I believe that replacement units that ‘are not’ rebuildable are still available and probably from Cars.
Center links are rebuildable if you can source the ball joints. I’ve never come across a post with a part number for these, here or anywhere else.
My ball joints and upper control arms seem to still be in proper order but I did replace the boots on the ball joints using “universal” boots from one of the urethane manufacturers. You could do the same on the tie rod’s ball joints to the center link but as far as I know, there is no shim between the tie rods and link.
Ray