Dorman Wheel Cylinder --. Qualified by Dorman’s strenuous testing procedures. 74 B300 Van Rear, Left, Bore: 1 in.; 12 in. X 2.50 in. 78-79 B300 Rear, Left, Bore: 1 in.; 12 in. Brake; 12 in. Brake; With Single Rear Wheel.
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