The TeraFlex IR Bushing Replacement Tool Kit for long and short adjustable Alpine Control Arms and preset Sport Control Arms makes swapping your factory-style bushings over to our innovative IR Bushings as simple as it gets. ‘ The easy-to-use replacement tool requires two open-end wrenches or sockets to install IR Bushings into your existing control arms. A bench vise is helpful, but not required. Can also be used to replace existing IR bushings.