Dorman W3406 Drum Brake Wheel Cylinder. Fits what vehicles: 1946 GMC EC350, 1947 GMC EC280, 1947 GMC EC282, 1947 GMC EC283, 1947-1950 GMC FC280, 1947-1950 GMC FC281, 1947 GMC FC283, 1947-1950 GMC FC300, 1947-1950 GMC FC350, 1947-1950 GMC FCS300, 1947-1950 GMC FCS350.
