Wheel Cylinder Set: 59-64 REAR Full Size Chev/Pontiac - PAIRThis set includes brand new rear wheel cylinders designed for 1959 1964 Impala, Belair, Pontiac Parisienne, and Laurentian models. Featuring a 1" bore, the set comes complete as displayed and includes two cylinders. Each vehicle requires two wheel cylinders, and this listing is for a pair. Its important to replace both cylinders simultaneously unless one was recently changed. Hydraulic pressure naturally targets the weaker, older seal, so replacing