I replaced mine last year. The flat snap rings without holes are a PITA, and I couldn't get a regular ball joint press to fit back there so I homebrewed a press from a threaded rod, various sockets, and some PVC pipe. IIRC the receiving cup from my kit couldn't fit flat on the swing arm. OE and aftermarket tools have part of the receiving cup cut out so that it can lay flat and clear the protrusion on the swing arm.


As for whether they need to be done, one of mine seemed worn more than the other one which was about as stiff as the new ones. No idea if the PO had one replaced.