This is a new old stock set of Alcon Raybestos, 1.42" (36mm) 12 bolt , 72 vane, racing rotors. Part #'s PR2020L & R, for use w/ PFC pad shape #7790 (54mm sweep) ect.
These are one of the recommended heavy duty rotors for Alcon Raybestos PC1006 heavy intermediate 6 piston calipers. Will also fit AP 5810 6 piston calipers.