StopTech replacement rotor rings come with mounting hardware included. StopTech mounting hardware is a different design than the Brembo hardware that originally came with your kit. Thus, you should follow these installation instructions, when mounting StopTech AeroRotors to your Brembo hats: StopTech Rotor Installation Instructions
In several sizes (328, 332, and 345mm) StopTech rotors have thicker mounting flanges than Brembo rotors. These mounting flanges may interfere with a raised lip on Brembo rotor hats. If so, an automotive machine shop can easily remove the lip from your Brembo hats in minutes, using a lathe. This is a minor modification that our customers have been doing for years.