1975 GMC P25 Bore: 1.0625 In. Brakes; Position: Rear;. 1976 GMC P25 Bore: 1.0625 In. 1977 GMC P25 Bore: 1.0625 In. 1978 GMC P25 Bore: 1.0625 In. Drum Brake Wheel Cylinder. WHEEL CYLINDER. Brake Component Inlet Thread Size: 3/8-24 in.
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Dorman 385IM80 Drum Brake Wheel Cylinder Kit Fits 1941 Hudson Super Series 11