Over time your factory rubber bushings will deteriorate and wear out eventually needing replacement. This factory Subaru BRZ/FRS/86 front control arm bushing is the rear most bushing on the front control arm. If you live in an area that see's salt/sand or other nasty debris on your roads, this stuff acts like sandpaper and will eventually destroy this bushing. Of the 2 bushings on the front control arm, this one takes a large amount of abuse and may need to be replaced as early as 50k miles. This is a factory replacement part. Sold individually (not in pairs).