The R1 Concepts Geo-Carbon drilled-and-slotted rotor (DFC) is offered for Audi A3 front and rear applications spanning 2005–2021. The overview describes the rotor as the drilled-and-slotted Geo-Carbon option for those A3 years and confirms front and rear fitment per the source, keeping language centered on rotor pattern and supported application.
DFC 05-21 Audi A3 Front & Rear Drilled & Slotted Geoperformance Rotors