The R1 Concepts slotted brake rotor for Audi 90 Quattro (1990–1991) is a front-right replacement finished in black. Offered for the front-right wheel position on the specified years, this slotted rotor corresponds to the listed Quattro fitment and provides the slotted rotor style and black finish described in the source.
R1 90-91 Audi 90 Quattro Front Right Slotted Black Brake Rotor