OER Parts offers a wide selection of Brake Components for your 1947 GMC Truck. OER Parts offers 1947 GMC Truck Wheel Cylinders, 1947 GMC Truck Front Wheel Cylinders 1947 GMC Truck Rear Wheel Cylinders, 1947 GMC Truck Wheel Cylinder Retainer, 1947 GMC Truck Drum Brake Bleeder Screws, 1947 GMC Truck Front Wheel Cylinder Repair Set, 1947 GMC Truck Rear Wheel Cylinder Repair Set, and 1947 GMC Truck Wheel Cylinder Pins.