1976-1978 GMC C35. Notes: Drum Brake Wheel Cylinder -- 6,600 to 8,200 Lb. GVW; Bore: 1.0625 In. Specifically engineered to be direct match for original drum brake wheel cylinder. Position: Rear. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.