Drilled & Slotted Rotor, Replacement for JEGS Rear Disc Brake Conversion Kits, Left/Driver Side Rear, GM 10-Bolt, 12-Bolt, Ford 9 in., GM Bolt Pattern 5 x 4.75 in. w/ 7/16 in. Studs, Ford Bolt Pattern 5 x 4.5 in. w/ 1/2 in. Studs|JEGS Drilled & Slotted Rear Brake Rotor Left/Driver Side for Ford 9 in. or GM 10-bolt, 12-Bolt.