The R1 Concepts drilled-and-slotted black brake rotor for 1997–2005 Buick Century is listed as a direct replacement for the rear-right position. It includes the drilled and slotted braking surface and black finish described in the catalog—verify your Century's model year and that you need a rear-right rotor to ensure correct fitment before purchase.
R1 97-05 Buick Century Rear Right Drilled & Slotted Black Brake Rotor