This stabilizer is extremely adjustable and rugged. The unit comes with all hardware needed for an easy installation and mounts up to your KFX in approximately 15 minutes; no drilling, welding, or grinding needed. The Pro stabilizer has a built in reservoir to compensate for thermal expansion. The stock steering stem diameter for the KFX is 1.25". If your aftermarket stem has a different then stock diameter please choose the correct diameter from the pull-down list below.