Specifically designed to meet racing demands, without the compromises that street drivers require, these shocks transform the handling of your 911. You get a wider range of adjustment and improved cornering grip. In our testing at Laguna Seca, these Koni race shocks gave us about 1/2 second per lap advantage over that other brand. For your front set, order the cap nuts that match your struts. Fronts do not fit 911 Koni struts 1974-on, or early 911 converted hydropneumatic struts.