The bars are available as a kit or individually. Due to their balanced design, we HIGHLY recommend purchasing them as a kit. Both sway bars come with everything necessary for installation, and are compatible with stock or most aftermarket end-links. However, if you have already installed a more aggressive rear sway bar, the COBB front sway bar is available by itself. Installing a stiffer front sway bar can dramatically increase the turn-in response, making your WRX just that much more nimble.