Brake kit, article #D52 on the caliper.
1964-1972 GM A Body ( Chevelle, GTO, Cutlass) Front Disc Brake Kit includes:

Stock Height spindles
Vented 11" rotors 5"x4.75" w/ 7/16" studs
Dust caps
Inner & outer bearings, seals, & mounting hardware
Front caliper brackets
Backing Plates
Front rubber brake hoses
Large GM single piston calipers pre-loaded with pads

Must use 15" or larger rims.