These anti-roll bar end links replaced the stamped steel and plastic ones on our 2002 Focus. The stock ones were completely separated on one side (the ball had popped out of the plastic socket), so the body roll was not being controlled by the anti-roll bar at all. The stock Ford parts are underbuilt and breakage-prone weak points. The Moog parts are, by contrast, very heavily overbuilt, have grease fittings and a strong metal-on-metal design that can't (by design) fail in the way Fords do. The ability to be greased (if used, of course) keeps the wear, and subsequent noise, factor to a minimum. Also, the Moog end links have wrench flats at the stud base to simplify torqueing the nuts properly. The flats do need a thin-jawed wrench (a regular open end or combination wrench, not a Crescent wrench), but are an otherwise fine feature.