1961 GMC 1000 Series Bore: 1 In.; Position: Rear Right;. Drum Brake Wheel Cylinder. 1963 GMC 1000 Series Bore: 1 In.; Position: Rear Right;. 1960 GMC 1000 Series Bore: 1 In.; Position: Rear Right;. 1962 GMC 1000 Series Bore: 1 In.; Position: Rear Right;.
