Notes: Drum Brake Wheel Cylinder Kit -- Bore: 11/16 In.; With RPO Code JA1 (Light Duty Brakes). 1982-1983 Pontiac 6000. 1984-1987 Pontiac 6000. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.