Until now, track enthusiasts who had stock bumpers on their 1974-1989 Porsche 911, 912, and 930's have had no options for mounting tow hooks for track applications. Rennline's new tow hook receivers replace the factory bumper shocks with a crush style tube that the Rennline’s ”screw in” style tow hooks thread into, allowing a completely stock appearance on the street and enhanced functionality on the track. All Rennline’s tow hooks have a 2" opening, as required by most track sanctioning bodies. Powder-coated steel construction with stainless steel hardware, comes with black rubber bumper plug for stock appearance when hook is removed. Screw in hook sold separately.