Girodisc Front 380mm 2pc Rotor for Lamborghini Murcielago (8 Pot)The Girodisc system is a direct replacement for the OE disc. No modifications are necessary. The disc will bolt directly to the car and work with OE calipers perfectly. The factory rotors are 365mm and these are 380mm discs and require the use of a supplied caliper spacer. The Girodisc front rotors are approx 24. 5lbs vs. 27lbs for the stock units. By upgrading your brakes with lightweight high performance replacements as opposed to a big brake kit,