About Labwork： Labwork is an Auto Parts One-Stop Solution brand of more than 10 years, which specializes in providing global customers with top-notched quality automotive parts & accessories . If you need any auto parts, its enough to come to Labwork. Features： Brake Booster Diaphragm Style: Dual Diaphragm Diameter (in): 10.4 Diaphragm Diameter (mm): 264.16 Master Cylinder Included: No Master Cylinder Stud Thread Size: M10x1.5 Fitment： For 1974 Chevrolet Blazer All Engine with Dual Diaphragm Booster For 1975-1977 Chevrolet C10 All Engine With Brake Code JB5 .
