So shortly after I bought the Legacy, I upped the rear sway to a Whiteline 20 mm sway (or so) and left the stock endlinks to die on that. Fast forward 4 years of wimpy driving on my part, and I'm listening to what I forgot. I was blaming struts, bushings, everything but the end links. I finally got under the car and got out the bad endlink after I remembered leaving the stockers in there. For the tiny bit of play, I can't believe how loud that sounded in the car. I got a pair of heavy duty ones from NAPA with grease fittings. I got the new one in as the sun went under today. The other side is getting penetrating oil until I can get back at it. It may get the saw, it seems pretty stuck and it's a lousy spot to reach.
I still can't believe that little bit of play made so much noise.